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CVE-2017-18269

An SSE2-optimized memmove implementation for i386 in sysdeps/i386/i686/multiarch/memcpy-sse2-unaligned.S in the GNU C Library (aka glibc or libc6) 2.21 through 2.27 does not correctly perform the overlapping memory check if the source memory range spans the middle of the address space, resulting in corrupt data being produced by the copy operation. This may disclose information to…

Severity
Critical 9.8
Published
18 May 2018
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
4.5% in the next 30 daysHigher than 91% of CVEs. EPSS by FIRST, 10 Nov 2026
Weakness
Memory buffer errors (CWE-119)
Attack
Over the network · No login needed · No user action needed
Attacker can
Read data · Change data · Take it down
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Sources
NVD

Description

An SSE2-optimized memmove implementation for i386 in sysdeps/i386/i686/multiarch/memcpy-sse2-unaligned.S in the GNU C Library (aka glibc or libc6) 2.21 through 2.27 does not correctly perform the overlapping memory check if the source memory range spans the middle of the address space, resulting in corrupt data being produced by the copy operation. This may disclose information to context-dependent attackers, or result in a denial of service, or, possibly, code execution.

From NVD.

Affected software

SoftwareAffected versions
GNU C LibraryServers and applications · cpe:a:gnu:glibc
  • From 2.21 up to 2.27

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2017-18269
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2017-18269