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Vulnerability record · CVE-2020-6096 · published 1 April 2020

CVE-2020-6096: Gnu glibc vulnerability

Gnu · Glibc

An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc 2.30.9000. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative value for the 'num' parameter results in a signed comparison vulnerability. If an attacker underflows the 'num' parameter to memcpy(), this vulnerability could lead to undefined behavior such as writing to out-of-bounds memory and potentially remote code execution. Furthermore, this memcpy() implementation allows for program execution to continue in scenarios where a segmentation fault or crash should have occurred. The dangers occur in that subsequent execution and iterations of this code will be executed with this corrupted data.

8.1 CVSS 3.1 High EPSS 5.4% · top 7.6% CWE-195 · CWE-195CWE-191 · CWE-191
8.1CVSS 3.1 base score, v2 6.8
5.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
14References
17 Jun 2026Last modified by NVD

Description

An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc 2.30.9000. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative value for the 'num' parameter results in a signed comparison vulnerability. If an attacker underflows the 'num' parameter to memcpy(), this vulnerability could lead to undefined behavior such as writing to out-of-bounds memory and potentially remote code execution. Furthermore, this memcpy() implementation allows for program execution to continue in scenarios where a segmentation fault or crash should have occurred. The dangers occur in that subsequent execution and iterations of this code will be executed with this corrupted data.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%
https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPYXTDOOB4PQGTYAMZAZNJI
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/URXOIA2LDUKHQXK4BE55BQB
https://security.gentoo.org/glsa/202101-20 Third Party Advisory
https://sourceware.org/bugzilla/show_bug.cgi?id=25620 Issue TrackingThird Party Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1019 Third Party Advisory
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%
https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPYXTDOOB4PQGTYAMZAZNJI
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/URXOIA2LDUKHQXK4BE55BQB
https://security.gentoo.org/glsa/202101-20 Third Party Advisory
https://sourceware.org/bugzilla/show_bug.cgi?id=25620 Issue TrackingThird Party Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1019 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-6096), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.