Is CVE-2021-3594 in the CISA KEV catalog?

No. CVE-2021-3594 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3594?

CVE-2021-3594 has a CVSS v3 base score of 3.8 (LOW).

What is the EPSS score for CVE-2021-3594?

CVE-2021-3594 has an EPSS score of 0.33% (25th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3594?

Upgrade libslirp on debian 11 to 4.4.0-1+deb11u2 or later. Fixes are available for 17 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3594

LOW

3.8

CVSS v3

NVD

Description

An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp_input() function and could occur while processing a udp packet that is smaller than the size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.

CWE-824

How to fix

Remediation Available

libslirpDebian

Fixed in:4.4.0-1+deb11u2CVE-2021-3594

Fixed in:4.6.1-1CVE-2021-3594

libslirpUbuntu

Fixed in:4.1.0-2ubuntu2.2USN-5009-1

libslirp0Ubuntu

Fixed in:4.1.0-2ubuntu2.2USN-5009-1

qemuUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.47+esm4USN-7094-1

Fixed in:1:2.5+dfsg-5ubuntu10.51+esm3USN-7094-1

Fixed in:1:2.11+dfsg-1ubuntu7.37USN-5010-1

Fixed in:1:2.11+dfsg-1ubuntu7.42+esm2USN-7094-1

Fixed in:1:4.2-3ubuntu6.17USN-5010-1

Fixed in:1:4.2-3ubuntu6.30USN-7094-1

Fixed in:1:6.2+dfsg-2ubuntu6.24USN-7094-1

Fixed in:1:8.2.2+ds-0ubuntu1.4USN-7094-1

qemu-systemUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.47+esm4USN-7094-1

Fixed in:1:2.5+dfsg-5ubuntu10.51+esm3USN-7094-1

Fixed in:1:2.11+dfsg-1ubuntu7.42+esm2USN-7094-1

Fixed in:1:2.11+dfsg-1ubuntu7.37USN-5010-1

Fixed in:1:4.2-3ubuntu6.30USN-7094-1

Fixed in:1:4.2-3ubuntu6.17USN-5010-1

Fixed in:1:6.2+dfsg-2ubuntu6.24USN-7094-1

Fixed in:1:8.2.2+ds-0ubuntu1.4USN-7094-1

qemu-system-aarch64Ubuntu

Fixed in:2.0.0+dfsg-2ubuntu1.47+esm4USN-7094-1

Fixed in:1:2.5+dfsg-5ubuntu10.51+esm3USN-7094-1

qemu-system-armUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.47+esm4USN-7094-1

Fixed in:1:2.5+dfsg-5ubuntu10.51+esm3USN-7094-1

Fixed in:1:2.11+dfsg-1ubuntu7.37USN-5010-1

Fixed in:1:2.11+dfsg-1ubuntu7.42+esm2USN-7094-1

Fixed in:1:4.2-3ubuntu6.30USN-7094-1

Fixed in:1:4.2-3ubuntu6.17USN-5010-1

Fixed in:1:6.2+dfsg-2ubuntu6.24USN-7094-1

Fixed in:1:8.2.2+ds-0ubuntu1.4USN-7094-1

qemu-system-commonUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.47+esm4USN-7094-1

Fixed in:1:2.5+dfsg-5ubuntu10.51+esm3USN-7094-1

qemu-system-mipsUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.47+esm4USN-7094-1

Fixed in:1:2.5+dfsg-5ubuntu10.51+esm3USN-7094-1

Fixed in:1:2.11+dfsg-1ubuntu7.37USN-5010-1

Fixed in:1:2.11+dfsg-1ubuntu7.42+esm2USN-7094-1

Fixed in:1:4.2-3ubuntu6.17USN-5010-1

Fixed in:1:4.2-3ubuntu6.30USN-7094-1

Fixed in:1:6.2+dfsg-2ubuntu6.24USN-7094-1

Fixed in:1:8.2.2+ds-0ubuntu1.4USN-7094-1

qemu-system-miscUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.47+esm4USN-7094-1

Fixed in:1:2.5+dfsg-5ubuntu10.51+esm3USN-7094-1

Fixed in:1:2.11+dfsg-1ubuntu7.37USN-5010-1

Fixed in:1:2.11+dfsg-1ubuntu7.42+esm2USN-7094-1

Fixed in:1:4.2-3ubuntu6.17USN-5010-1

Fixed in:1:4.2-3ubuntu6.30USN-7094-1

Fixed in:1:6.2+dfsg-2ubuntu6.24USN-7094-1

Fixed in:1:8.2.2+ds-0ubuntu1.4USN-7094-1

qemu-system-ppcUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.47+esm4USN-7094-1

Fixed in:1:2.5+dfsg-5ubuntu10.51+esm3USN-7094-1

Fixed in:1:2.11+dfsg-1ubuntu7.42+esm2USN-7094-1

Fixed in:1:2.11+dfsg-1ubuntu7.37USN-5010-1

Fixed in:1:4.2-3ubuntu6.17USN-5010-1

Fixed in:1:4.2-3ubuntu6.30USN-7094-1

Fixed in:1:6.2+dfsg-2ubuntu6.24USN-7094-1

Fixed in:1:8.2.2+ds-0ubuntu1.4USN-7094-1

qemu-system-s390xUbuntu

Fixed in:1:2.5+dfsg-5ubuntu10.51+esm3USN-7094-1

Fixed in:1:2.11+dfsg-1ubuntu7.42+esm2USN-7094-1

Fixed in:1:2.11+dfsg-1ubuntu7.37USN-5010-1

Fixed in:1:4.2-3ubuntu6.30USN-7094-1

Fixed in:1:4.2-3ubuntu6.17USN-5010-1

Fixed in:1:6.2+dfsg-2ubuntu6.24USN-7094-1

Fixed in:1:8.2.2+ds-0ubuntu1.4USN-7094-1

qemu-system-sparcUbuntu

Fixed in:2.0.0+dfsg-2ubuntu1.47+esm4USN-7094-1

Fixed in:1:2.5+dfsg-5ubuntu10.51+esm3USN-7094-1

Fixed in:1:2.11+dfsg-1ubuntu7.42+esm2USN-7094-1

Fixed in:1:2.11+dfsg-1ubuntu7.37USN-5010-1

Fixed in:1:4.2-3ubuntu6.30USN-7094-1

Fixed in:1:4.2-3ubuntu6.17USN-5010-1

Fixed in:1:6.2+dfsg-2ubuntu6.24USN-7094-1

Fixed in:1:8.2.2+ds-0ubuntu1.4USN-7094-1

qemu-system-x86Ubuntu

Fixed in:2.0.0+dfsg-2ubuntu1.47+esm4USN-7094-1

Fixed in:1:2.5+dfsg-5ubuntu10.51+esm3USN-7094-1

Fixed in:1:2.11+dfsg-1ubuntu7.37USN-5010-1

Fixed in:1:2.11+dfsg-1ubuntu7.42+esm2USN-7094-1

Fixed in:1:4.2-3ubuntu6.17USN-5010-1

Fixed in:1:4.2-3ubuntu6.30USN-7094-1

Fixed in:1:6.2+dfsg-2ubuntu6.24USN-7094-1

Fixed in:1:8.2.2+ds-0ubuntu1.4USN-7094-1

qemu-system-x86-microvmUbuntu

Fixed in:1:4.2-3ubuntu6.30USN-7094-1

Fixed in:1:4.2-3ubuntu6.17USN-5010-1

Fixed in:1:6.2+dfsg-2ubuntu6.24USN-7094-1

qemu-system-x86-xenUbuntu

Fixed in:1:4.2-3ubuntu6.17USN-5010-1

Fixed in:1:4.2-3ubuntu6.30USN-7094-1

Fixed in:1:6.2+dfsg-2ubuntu6.24USN-7094-1

Fixed in:1:8.2.2+ds-0ubuntu1.4USN-7094-1

qemu-system-xenUbuntu

Fixed in:1:8.2.2+ds-0ubuntu1.4USN-7094-1

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 VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.33%probability of exploitation in 30 days

25thpercentile

Low risk: more likely to be exploited than 25% of all known CVEs.

References

Patch1

bugzilla.redhat.com

Third-Party Advisory3

Other references3

Related Vulnerabilities

Other CWE-824 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2018-9948	Medium	6.5	64%	-	-
CVE-2018-11803	High	7.5	58%	-	Fix
CVE-2022-21971	High	7.8	54%	KEV	Fix
CVE-2010-1818	High	9.3	43%	-	-
CVE-2015-1770	High	8.8	35%	KEV	-
CVE-2017-12561	Critical	9.8	31%	-	-

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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 2024-11-21.