VulnerabilityModified

CVE-2020-29573

HIGH 7.5EPSS 2.80%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (2.80%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 3.1: 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 2.80% probability · 86th percentile
CISA KEV: Not listed
Weakness: CWE-787
Affected: gnu/glibc · redhat/enterprise linux · netapp/cloud backup · netapp/solidfire baseboard management controller
Source: cve@mitre.org

References

https://security.gentoo.org/glsa/202101-20Third Party Advisory
https://security.netapp.com/advisory/ntap-20210122-0004/Third Party Advisory
https://sourceware.org/bugzilla/show_bug.cgi?id=26649Issue Tracking, Patch, Third Party Advisory
https://sourceware.org/pipermail/libc-alpha/2020-September/117779.htmlPatch, Third Party Advisory
https://security.gentoo.org/glsa/202101-20Third Party Advisory
https://security.netapp.com/advisory/ntap-20210122-0004/Third Party Advisory
https://sourceware.org/bugzilla/show_bug.cgi?id=26649Issue Tracking, Patch, Third Party Advisory
https://sourceware.org/pipermail/libc-alpha/2020-September/117779.htmlPatch, Third Party Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.