Is CVE-2023-27536 in the CISA KEV catalog?

No. CVE-2023-27536 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-27536?

CVE-2023-27536 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2023-27536?

CVE-2023-27536 has an EPSS score of 1.57% (72th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-27536?

Upgrade curl on debian 11 to 7.74.0-1.3+deb11u8 or later. Fixes are available for 27 affected products.

CVE & CISA-KEV Catalog

CVE-2023-27536

MEDIUMEPSS 72th pctl

5.9

CVSS v3

NVD

Description

An authentication bypass vulnerability exists libcurl <8.0.0 in the connection reuse feature which can reuse previously established connections with incorrect user permissions due to a failure to check for changes in the CURLOPT_GSSAPI_DELEGATION option. This vulnerability affects krb5/kerberos/negotiate/GSSAPI transfers and could potentially result in unauthorized access to sensitive information. The safest option is to not reuse connections if the CURLOPT_GSSAPI_DELEGATION option has been changed.

CWE-305 CWE-287Improper Authentication

How to fix

Remediation Available

curlDebian

Fixed in:7.74.0-1.3+deb11u8CVE-2023-27536

Fixed in:7.88.1-7CVE-2023-27536

curlRocky

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

curlRed Hat / RHEL

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

curl-debuginfoRocky

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

curl-debuginfoRed Hat / RHEL

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

curl-debugsourceRed Hat / RHEL

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

curl-debugsourceRocky

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

curl-minimalRed Hat / RHEL

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

curl-minimalRocky

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

curl-minimal-debuginfoRocky

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

curl-minimal-debuginfoRed Hat / RHEL

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

libcurlRocky

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

libcurlRed Hat / RHEL

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

libcurl-debuginfoRocky

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

libcurl-debuginfoRed Hat / RHEL

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

libcurl-develRed Hat / RHEL

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

libcurl-develRocky

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

libcurl-minimalRocky

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

libcurl-minimalRed Hat / RHEL

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

libcurl-minimal-debuginfoRed Hat / RHEL

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

libcurl-minimal-debuginfoRocky

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.61.1-30.el8_8.3RHSA-2023:4523

Fixed in:0:7.61.1-22.el8_6.12RHSA-2024:0428

Fixed in:0:7.76.1-26.el9RHSA-2023:6679

curlUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm15USN-5964-2

Fixed in:7.47.0-1ubuntu2.19+esm8USN-5964-2

Fixed in:7.58.0-2ubuntu3.24USN-5964-1

Fixed in:7.68.0-1ubuntu2.18USN-5964-1

Fixed in:7.81.0-1ubuntu1.10USN-5964-1

Fixed in:7.85.0-1ubuntu0.5USN-5964-1

libcurl3Ubuntu

Fixed in:7.35.0-1ubuntu2.20+esm15USN-5964-2

Fixed in:7.47.0-1ubuntu2.19+esm8USN-5964-2

libcurl3-gnutlsUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm15USN-5964-2

Fixed in:7.47.0-1ubuntu2.19+esm8USN-5964-2

Fixed in:7.58.0-2ubuntu3.24USN-5964-1

Fixed in:7.68.0-1ubuntu2.18USN-5964-1

Fixed in:7.81.0-1ubuntu1.10USN-5964-1

Fixed in:7.85.0-1ubuntu0.5USN-5964-1

libcurl3-nssUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm15USN-5964-2

Fixed in:7.47.0-1ubuntu2.19+esm8USN-5964-2

Fixed in:7.58.0-2ubuntu3.24USN-5964-1

Fixed in:7.68.0-1ubuntu2.18USN-5964-1

Fixed in:7.81.0-1ubuntu1.10USN-5964-1

Fixed in:7.85.0-1ubuntu0.5USN-5964-1

libcurl4Ubuntu

Fixed in:7.58.0-2ubuntu3.24USN-5964-1

Fixed in:7.68.0-1ubuntu2.18USN-5964-1

Fixed in:7.81.0-1ubuntu1.10USN-5964-1

Fixed in:7.85.0-1ubuntu0.5USN-5964-1

UniversalForwarderWindows application

Affected:8.2.0 8.2.12Fixed in:8.2.12Splunk, Inc.

Affected:9.0.0 9.0.6Fixed in:9.0.6Splunk, Inc.

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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

1.57%probability of exploitation in 30 days

72ndpercentile

Elevated risk: more likely to be exploited than 72% of all known CVEs.

References

Exploit1

hackerone.com

Third-Party Advisory4

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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 2025-02-14.