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CVE-2020-29573

7.5 · HIGH

sysdeps/i386/ldbl2mpn.c in the GNU C Library (aka glibc or libc6) before 2.23 on x86 targets has a stack-based buffer overflow if the input to any of the printf family of functions is an 80-bit lon…

Published Dec 6, 2020CWE-787EPSS 2.72%

Overview

CVE-2020-29573 is a high-severity vulnerability. It was published on December 6, 2020 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

sysdeps/i386/ldbl2mpn.c in the GNU C Library (aka glibc or libc6) before 2.23 on x86 targets has a stack-based buffer overflow if the input to any of the printf family of functions is an 80-bit long double with a non-canonical bit pattern, as seen when passing a \x00\x04\x00\x00\x00\x00\x00\x00\x00\x04 value to sprintf. NOTE: the issue does not affect glibc by default in 2016 or later (i.e., 2.23 or later) because of commits made in 2015 for inlining of C99 math functions through use of GCC built-ins. In other words, the reference to 2.23 is intentional despite the mention of "Fixed for glibc 2.33" in the 26649 reference.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refsecurity.gentoo.org/glsa/202101-20Refsecurity.netapp.com/advisory/ntap-20210122-0004/Refsourceware.org/bugzilla/show_bug.cgi?id=26649Refsourceware.org/pipermail/libc-alpha/2020-September/117779.htmlRefsecurity.gentoo.org/glsa/202101-20Refsecurity.netapp.com/advisory/ntap-20210122-0004/Refsourceware.org/bugzilla/show_bug.cgi?id=26649Refsourceware.org/pipermail/libc-alpha/2020-September/117779.html

How CyberStrike helps

Frequently asked questions

What is CVE-2020-29573?

CVE-2020-29573 is a high-severity vulnerability. It was published on December 6, 2020 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2020-29573?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2020-29573?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-29573?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-29573 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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