CVE•Published 2024-01-31•Modified 2026-05-12•1 article on news•6 live references•NVD data

CVE-2023-6779Gnu · Glibc

Vulnerability data via NVD (ingested)

CVSS v3.1

8.2

HIGH

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

EPSS percentile

Exploit Prediction Scoring System · top 29% of all CVEs

Weaknesses (CWE)

CWE-122Heap-based Buffer Overflow CWE-787Out-of-bounds Write

Description

An off-by-one heap-based buffer 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 message bigger than INT_MAX bytes, leading to an incorrect calculation of the buffer size to store the message, resulting in an application crash. This issue affects glibc 2.37 and newer.

Timeline

Published 2024-01-31

Modified 2026-05-12

External references

NVD MITRE Exploit-DB GitHub PoC trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2023-6779

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Gnu Glibc"

All exposed Gnu Glibc instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Glibc"

HTTP body or banner mentions "Glibc" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2023-6779