CVEvulnerability
CVE-2020-29573
7.5 HIGH
Official page ↗
- Status
- Modified
- Published
- 2020-12-06
- Last modified
- 2026-10-14
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS 2.0 ([email protected])
- 5.0 MEDIUM — AV:N/AC:L/Au:N/C:N/I:N/A:P
- Weaknesses
- CWE-787
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.
Affected configurations
• gnu glibc (< 2.23)
• redhat enterprise linux 7.0
• netapp cloud backup
• netapp solidfire baseboard management controller
Related
Weakness · CWE (1)
- CWE-787 Out-of-bounds Write weakness
References
- https://security.gentoo.org/glsa/202101-20 Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210122-0004/ Third Party Advisory
- https://sourceware.org/bugzilla/show_bug.cgi?id=26649 Issue Tracking, Patch, Third Party Advisory
- https://sourceware.org/pipermail/libc-alpha/2020-September/117779.html Patch, Third Party Advisory
- https://security.gentoo.org/glsa/202101-20 Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210122-0004/ Third Party Advisory
- https://sourceware.org/bugzilla/show_bug.cgi?id=26649 Issue Tracking, Patch, Third Party Advisory
- https://sourceware.org/pipermail/libc-alpha/2020-September/117779.html Patch, Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html cert-portal.siemens.com