CVE-2023-44487

HIGHCISA KEVEPSS 100th pctl

7.5

CVSS v3

Description

The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.

CWE-400Resource Exhaustion

How to fix

Remediation Available

dnsdistDebian

Fixed in:1.8.2-2CVE-2023-44487

Windows 10 Version 1607Windows

Install:KB5031362Microsoft

Windows 10 Version 1809Windows

Install:KB5031361Microsoft

Windows 10 Version 21H2Windows

Install:KB5031356Microsoft

Windows 10 Version 22H2Windows

Install:KB5031356Microsoft

Windows 11 Version 22H2Windows

Install:KB5031354Microsoft

Windows 11 version 21H2Windows

Install:KB5031358Microsoft

Windows Server 2016Windows

Install:KB5031362Microsoft

Windows Server 2016 (Server Core installation)Windows

Install:KB5031362Microsoft

Windows Server 2019Windows

Install:KB5031361Microsoft

Windows Server 2019 (Server Core installation)Windows

Install:KB5031361Microsoft

Windows Server 2022Windows

Install:KB5031364Microsoft

Windows Server 2022 (Server Core installation)Windows

Install:KB5031364Microsoft

3scaleRed Hat / RHEL

Fixed in:amp2/backend-rhel8@sha256:e18b80f1a9a2282f7073c91c4f17fb4e24aa4cf95dd17fe384f61fd844a0f48b_amd64RHEA-2023:7327

Fixed in:amp2/memcached-rhel7@sha256:92320cd96dfb3e5279825f6a019c8c3c6d365252474dc4fe1ec9196d7e9d579f_ppc64leRHEA-2023:7327

Fixed in:amp2/zync-rhel8@sha256:13b6435c608b33a410e9766729a16f72b266158f5b176640cc8c8b46d5fd8987_amd64RHEA-2023:7327

Fixed in:amp2/zync-rhel8@sha256:eaa567f706c71f6351d4db8434094d5cf1e89c0c8aa2abee66734bf1225929f4_s390xRHEA-2023:7327

Fixed in:amp2/backend-rhel8@sha256:081ef7a49e91fd6a88a89e3d5c61f47f59658a3688635dc9680e7182f5af74c5_ppc64leRHEA-2023:7327

Fixed in:amp2/system-rhel7@sha256:f42d5705204ffbdbd3d72764d3a69008cad4b2384d630a44d5f700cdbba24a88_ppc64leRHEA-2023:7327

Fixed in:amp2/system-rhel7@sha256:18bdf176bc553ddf16c6738159c57b78b081ab646a051c130814cc84fcb3367f_amd64RHEA-2023:7327

Fixed in:amp2/memcached-rhel7@sha256:e66fe95ce5d29279dba41959c86a6c1c19d6e69cc4198bb1a6c994fbab47b009_s390xRHEA-2023:7327

3scaleRocky

Fixed in:amp2/backend-rhel8@sha256:081ef7a49e91fd6a88a89e3d5c61f47f59658a3688635dc9680e7182f5af74c5_ppc64leRHEA-2023:7327

Fixed in:amp2/zync-rhel8@sha256:eaa567f706c71f6351d4db8434094d5cf1e89c0c8aa2abee66734bf1225929f4_s390xRHEA-2023:7327

Fixed in:amp2/system-rhel7@sha256:f42d5705204ffbdbd3d72764d3a69008cad4b2384d630a44d5f700cdbba24a88_ppc64leRHEA-2023:7327

Fixed in:amp2/toolbox-rhel8@sha256:480e758bf61a1c77545daa8d078bf1f26ccfd5153723ea6e1159e61e5f11a5d0_s390xRHEA-2023:7327

Fixed in:amp2/backend-rhel8@sha256:3f67636d93ed7e1a5fd0ae3a9bc41e0ca4b80180d40638ffc9fc11e682740bfc_s390xRHEA-2023:7327

Fixed in:amp2/memcached-rhel7@sha256:92320cd96dfb3e5279825f6a019c8c3c6d365252474dc4fe1ec9196d7e9d579f_ppc64leRHEA-2023:7327

Fixed in:amp2/memcached-rhel7@sha256:e66fe95ce5d29279dba41959c86a6c1c19d6e69cc4198bb1a6c994fbab47b009_s390xRHEA-2023:7327

Fixed in:amp2/toolbox-rhel8@sha256:31b55a31c944120649adef59b3ed41ebb252acff454fafe9dd5bf5990abf7d1b_ppc64leRHEA-2023:7327

3scale-amp2/3scaleRed Hat / RHEL

Fixed in:rhel7-operator@sha256:f4508a6fffd3e604942e0e12239707e05cc5657765c100fb9953f0405206fd39_amd64RHEA-2023:7327

Fixed in:rhel7-operator@sha256:bde9ba77661146621d353e6d0827060292c72b8542ae8fd5d3790411a823c639_s390xRHEA-2023:7327

Fixed in:rhel7-operator@sha256:cb57b7338561b5e2c18759726847e33a164f95440b9e5682654638297d5c5f69_ppc64leRHEA-2023:7327

3scale-amp2/3scaleRocky

Fixed in:rhel7-operator@sha256:f4508a6fffd3e604942e0e12239707e05cc5657765c100fb9953f0405206fd39_amd64RHEA-2023:7327

Fixed in:rhel7-operator@sha256:bde9ba77661146621d353e6d0827060292c72b8542ae8fd5d3790411a823c639_s390xRHEA-2023:7327

Fixed in:rhel7-operator@sha256:cb57b7338561b5e2c18759726847e33a164f95440b9e5682654638297d5c5f69_ppc64leRHEA-2023:7327

3scale-amp2/3scale-authRocky

Fixed in:wasm-rhel8@sha256:a3641417e69305f6aaffe22459879e0c550eabd5d814d19896a417a1aabb4c9f_ppc64leRHEA-2023:7327

Fixed in:wasm-rhel8@sha256:6482676ba77f470ff671ac523674e86a609cfa064b59edeba84f5431423fba8d_amd64RHEA-2023:7327

3scale-amp2/3scale-authRed Hat / RHEL

Fixed in:wasm-rhel8@sha256:a3641417e69305f6aaffe22459879e0c550eabd5d814d19896a417a1aabb4c9f_ppc64leRHEA-2023:7327

Fixed in:wasm-rhel8@sha256:6482676ba77f470ff671ac523674e86a609cfa064b59edeba84f5431423fba8d_amd64RHEA-2023:7327

3scale-amp2/3scale-rhel7Rocky

Fixed in:operator-metadata@sha256:7640944214f9431f5783368d7c9a5a25fcb1b1c897755c07872138a5bf5ec6f7_ppc64leRHEA-2023:7327

Fixed in:operator-metadata@sha256:7f09c8239d22e839a201e2baa598ded32f15f66b2736d51159c4c3710d34b472_s390xRHEA-2023:7327

Fixed in:operator-metadata@sha256:352ab243649889842cf0f326cd4fce1868cfa57eb544f553eea8a6cdd6cb4d3e_amd64RHEA-2023:7327

3scale-amp2/3scale-rhel7Red Hat / RHEL

Fixed in:operator-metadata@sha256:352ab243649889842cf0f326cd4fce1868cfa57eb544f553eea8a6cdd6cb4d3e_amd64RHEA-2023:7327

Fixed in:operator-metadata@sha256:7f09c8239d22e839a201e2baa598ded32f15f66b2736d51159c4c3710d34b472_s390xRHEA-2023:7327

Fixed in:operator-metadata@sha256:7640944214f9431f5783368d7c9a5a25fcb1b1c897755c07872138a5bf5ec6f7_ppc64leRHEA-2023:7327

3scale-amp2/apicastRocky

Fixed in:rhel7-operator@sha256:f6b3e65a3acfdd12f3c091deecd95b86932ad1a0174d303a05fecca54c1cbc70_s390xRHEA-2023:7327

Fixed in:rhel7-operator@sha256:89b3c616730f3d88082e44fd9008c8c58dc85f7e3e55cf6817efc406e37fd861_ppc64leRHEA-2023:7327

Fixed in:rhel7-operator@sha256:4975248f24d7a5bb414729f66d98957cdac23cabefb1b6b8b60bc50d5e4a4ec7_amd64RHEA-2023:7327

Fixed in:gateway-rhel8@sha256:8b98559a9d68b7169664db60c8e492cdf3319771bcffafbd50468e93cfef9cfe_s390xRHEA-2023:7327

Fixed in:gateway-rhel8@sha256:d8cc91c649553c49e0da15f7ab7466be2e78ef3e00c2a7b743f69c1891b75dd5_amd64RHEA-2023:7327

Fixed in:gateway-rhel8@sha256:c352f6912a4e54bfe725360994674b4ce8a815777db7d3554b6634e341d1ed5a_ppc64leRHEA-2023:7327

3scale-amp2/apicastRed Hat / RHEL

Fixed in:rhel7-operator@sha256:89b3c616730f3d88082e44fd9008c8c58dc85f7e3e55cf6817efc406e37fd861_ppc64leRHEA-2023:7327

Fixed in:rhel7-operator@sha256:f6b3e65a3acfdd12f3c091deecd95b86932ad1a0174d303a05fecca54c1cbc70_s390xRHEA-2023:7327

Fixed in:gateway-rhel8@sha256:8b98559a9d68b7169664db60c8e492cdf3319771bcffafbd50468e93cfef9cfe_s390xRHEA-2023:7327

Fixed in:gateway-rhel8@sha256:d8cc91c649553c49e0da15f7ab7466be2e78ef3e00c2a7b743f69c1891b75dd5_amd64RHEA-2023:7327

Fixed in:gateway-rhel8@sha256:c352f6912a4e54bfe725360994674b4ce8a815777db7d3554b6634e341d1ed5a_ppc64leRHEA-2023:7327

Fixed in:rhel7-operator@sha256:4975248f24d7a5bb414729f66d98957cdac23cabefb1b6b8b60bc50d5e4a4ec7_amd64RHEA-2023:7327

3scale-amp2/apicast-rhel7Red Hat / RHEL

Fixed in:operator-metadata@sha256:6da016547c24d2c1e044ae8f6639da6a2975792583501d4fd7d9839935941739_ppc64leRHEA-2023:7327

Fixed in:operator-metadata@sha256:cb9e6381aa2b748a0ca7d6a90de784bfded5a57e0446df6b217b9b5112dfa9bc_s390xRHEA-2023:7327

Fixed in:operator-metadata@sha256:868ecb3ffa5a83b3eda3f7f4ba31dad0e57e97b857b657a46c8bbdfa69a27922_amd64RHEA-2023:7327

3scale-amp2/apicast-rhel7Rocky

Fixed in:operator-metadata@sha256:cb9e6381aa2b748a0ca7d6a90de784bfded5a57e0446df6b217b9b5112dfa9bc_s390xRHEA-2023:7327

Fixed in:operator-metadata@sha256:868ecb3ffa5a83b3eda3f7f4ba31dad0e57e97b857b657a46c8bbdfa69a27922_amd64RHEA-2023:7327

Fixed in:operator-metadata@sha256:6da016547c24d2c1e044ae8f6639da6a2975792583501d4fd7d9839935941739_ppc64leRHEA-2023:7327

advanced-cluster-security/rhacsRed Hat / RHEL

Fixed in:scanner-rhel8@sha256:244884cd861c50c1e9b6c0679707d2c0723798580a8d2341a188bcf357ed744c_ppc64leRHEA-2023:7235

Fixed in:collector-rhel8@sha256:f591a221d2dbe643b6d975d1a2e9b9289173e2e845a838ab850debe20c957f11_ppc64leRHSA-2023:6048

Fixed in:rhel8-operator@sha256:772b19a562fe52c709532b487233cfbfa8cee16f12da309fd4432df04792f32c_s390xRHSA-2023:6048

Fixed in:operator-bundle@sha256:75148e16a364e4f67ecb8e914fc16b7ca4112c4e844b0d361a3feb88468f1215_amd64RHSA-2023:6048

Fixed in:operator-bundle@sha256:43a9ee6780734436b8fd6db4207f43a62e38fab40f53584e7c220d119d1a9249_s390xRHEA-2023:7235

Fixed in:roxctl-rhel8@sha256:ad51e30709c6b9f4350473b72eed6f0cb037f41f08c675ad7868cc70462513ae_amd64RHSA-2023:5851

Fixed in:main-rhel8@sha256:2d91c9e119a9c6f69f5f6b44fd54cdb89a255a1f831c14c0346291a085cf1255_amd64RHSA-2023:5851

Fixed in:collector-rhel8@sha256:2168e357d9d8b663595aefd49434fa7b87e3dcb5dfb1aa9cceeddf656d89436f_ppc64leRHSA-2023:5851

advanced-cluster-security/rhacsRocky

Fixed in:rhel8-operator@sha256:103b5cd32930836320eea0b28532ff9160cea7b02ddbb6af47df7433f7bb47c4_ppc64leRHSA-2023:6048

Fixed in:roxctl-rhel8@sha256:fab7366274d9d9d903ecc42bbb0219954481eb2a9a43cbb046df9f31f522c4b4_s390xRHSA-2023:6048

Fixed in:roxctl-rhel8@sha256:2212f7d3213255fc9ff1e16fd9de290cd3a2e483c525f64b02c2ba77b3100fe1_ppc64leRHEA-2023:7235

Fixed in:main-rhel8@sha256:efb952d3ef97c51dbe6a90ec5d3601007dc0e28dcfbc87d17be9825d850e65d5_s390xRHEA-2023:7235

Fixed in:rhel8-operator@sha256:c8e10ca75c96cbb5290f01eadb4f60ad890122d47c004462f0495b0563397715_s390xRHEA-2023:7235

Fixed in:main-rhel8@sha256:f92ebfda68d49b1d0460cda21d8ccb4b5c9c88224b85e0aca9c2f6c29e195445_s390xRHSA-2023:6048

Fixed in:rhel8-operator@sha256:8dd2654d1e078941de8b8cbd1d9aa3348ff8893c35edb5c513116129eae74207_ppc64leRHSA-2023:6084

Fixed in:operator-bundle@sha256:42a9acbb0b0a6db326b51044c7e9c99f7a89b5861ac706eab1595b34146b77c4_ppc64leRHSA-2023:6084

advanced-cluster-security/rhacs-centralRocky

Fixed in:db-rhel8@sha256:c4915dcdfd96742aa5ba9ca38d0de9938ce9c85f6fffa867c35427829ee7462f_amd64RHSA-2023:6084

Fixed in:db-rhel8@sha256:f2fad967d9f9d6f8e8b9dbec3e2a581a43b64f02fdc584750e206674d655dd5f_s390xRHSA-2023:6048

Fixed in:db-rhel8@sha256:f8fa778d169160543339202f870232b6b00a1d01347f4041565cae9acc910ea9_s390xRHSA-2023:6084

Fixed in:db-rhel8@sha256:01bd7d0eb01bbccaedb4bd874f9d25ec1de15b6ffa7d9afa772c633c901b4d19_ppc64leRHSA-2023:5851

Fixed in:db-rhel8@sha256:8f37c6215c27e7231546a97987b471bae5f3f5cd7458989cc9f032d7429ce9a5_amd64RHSA-2023:6048

Fixed in:db-rhel8@sha256:3cd8fac5bf5766946d8ac21b7c7d3def12c7cad75ef7b713edfe87fb91fd9c35_amd64RHEA-2023:7235

Fixed in:db-rhel8@sha256:bed6dd0b095914635cc4c7492e7c7f312bc84138df4dbb63ce632835697da1eb_amd64RHSA-2023:5851

Fixed in:db-rhel8@sha256:3bc1334aaee127fc1574fe596038f32f179c21002de6915f8586d412271b91d0_s390xRHEA-2023:7235

advanced-cluster-security/rhacs-centralRed Hat / RHEL

Fixed in:db-rhel8@sha256:6acd2390016479b63d0dd7c3cbe2a08de658743aa5d9ab77a7a5a4203f5b3f47_ppc64leRHEA-2023:7235

Fixed in:db-rhel8@sha256:f92672857754ee0baad0e17802ec23aa3f14e11dce65b59f60a8002a21987c75_s390xRHSA-2023:5851

Fixed in:db-rhel8@sha256:bed6dd0b095914635cc4c7492e7c7f312bc84138df4dbb63ce632835697da1eb_amd64RHSA-2023:5851

Fixed in:db-rhel8@sha256:925bdf348da6851a2f0efd903ce3061b7d0ed7b17dee8aa76e4e3d75f0b28150_ppc64leRHSA-2023:6048

Fixed in:db-rhel8@sha256:8f37c6215c27e7231546a97987b471bae5f3f5cd7458989cc9f032d7429ce9a5_amd64RHSA-2023:6048

Fixed in:db-rhel8@sha256:3cd8fac5bf5766946d8ac21b7c7d3def12c7cad75ef7b713edfe87fb91fd9c35_amd64RHEA-2023:7235

Fixed in:db-rhel8@sha256:f8fa778d169160543339202f870232b6b00a1d01347f4041565cae9acc910ea9_s390xRHSA-2023:6084

Fixed in:db-rhel8@sha256:01bd7d0eb01bbccaedb4bd874f9d25ec1de15b6ffa7d9afa772c633c901b4d19_ppc64leRHSA-2023:5851

advanced-cluster-security/rhacs-collectorRocky

Fixed in:slim-rhel8@sha256:62935f4547ca279ac7eed8881b8377eb11795195496982033700ec88f00ec35f_amd64RHEA-2023:7235

Fixed in:slim-rhel8@sha256:6de4dae7bd8e1cae0bcf98e76380f10ce23e2d7868eac7189c5be44fb370c65b_s390xRHSA-2023:5851

Fixed in:slim-rhel8@sha256:0572022184db58987b3abb065f0abac5368d7163d671e287151986a4b18898cf_s390xRHSA-2023:6048

Fixed in:slim-rhel8@sha256:e1e02767ed017d12a4a88d823c33a5fd8c8aaafdb892955be98e41350b523f5f_s390xRHEA-2023:7235

Fixed in:slim-rhel8@sha256:8c32a894305bb7fc0ac7ed37872a8dbb09f50c387bd7eb9c955c6cd11c9cf4fe_ppc64leRHSA-2023:6084

Fixed in:slim-rhel8@sha256:2844fcd4aa1aa285fffd24d0d07bd0e23b0927236d8d52ca51dafe3f06724850_ppc64leRHSA-2023:6048

Fixed in:slim-rhel8@sha256:13315f5c0db23887865ac2d310bd33b6258ac409d185209656531bc0b1fa0b2a_amd64RHSA-2023:6048

Fixed in:slim-rhel8@sha256:ec6d6c5af603b2ca083e7a7600680e3e121daedc43c53b4c0c760463fc5e569c_amd64RHSA-2023:5851

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

100.00%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

HTTP/2 Rapid Reset Attack Vulnerability

HTTP/2 contains a rapid reset vulnerability that allows for a distributed denial-of-service attack (DDoS).

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Remediation due: 2023-10-31

References

Related Vulnerabilities

Other CWE-400 (Resource Exhaustion) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2011-3192	High	7.8	99%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2023-21547	High	7.5	89%	-	Fix
CVE-2024-25617	Medium	5.3	89%	-	Fix
CVE-2018-1000115	High	7.5	88%	-	Fix

Common questions

How do I fix CVE-2023-44487?

Published advisories record a fix for 411 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2023-44487 being actively exploited?

Yes. CVE-2023-44487 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2023-10-31. Treat it as a priority whatever its CVSS score says.

How severe is CVE-2023-44487?

CVE-2023-44487 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2023-44487 affect?

Published advisories record a fix for dnsdist (Debian), Windows 10 Version 1607 (Windows), Windows 10 Version 1809 (Windows), Windows 10 Version 21H2 (Windows), and 407 more. The list on this page is capped, so there may be more.

Embed a live status badge for CVE-2023-44487

Markdown

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-11.