Integer overflow in Gnu Glibc
CVE-2023-6780
An integer overflow was found in the __vsyslog_internal function of the glibc library. This function is called by the syslog and vsyslog functions. This issue occurs when these functions are called with a very long message, leading to an incorrect calculation of the buffer size to store the message, resulting in undefined behavior. This issue affects glibc 2.37 and newer.
EPSS: 0.027 (84.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Gnu Glibc
- Fedora
- Fedoraproject Fedora — versions 38, 39
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- N/a Glibc — versions 2.39
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (Exploit, VDB Entry, Third Party Advisory)
- secalert@redhat.com (Exploit, Mailing List, Third Party Advisory)
- secalert@redhat.com (x_refsource_REDHAT, Third Party Advisory, vdb-entry)
- RHBZ#2254396 (x_refsource_REDHAT, issue-tracking, Issue Tracking)
- secalert@redhat.com (Mailing List)
- secalert@redhat.com (Mailing List)
- secalert@redhat.com (Third Party Advisory)
- secalert@redhat.com (Exploit, Mailing List)
- secalert@redhat.com (Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2023-6780?
- CVE-2023-6780 is a medium-severity vulnerability in Gnu Glibc, classified under Incorrect Calculation of Buffer Size. CVSS score: 5.3/10. Published 2024-01-31.
- How severe is CVE-2023-6780?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2023-6780 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.