CVE-2023-6246

HIGHPre-NVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

Score 8.4 from GitHub Security Advisory (severity: HIGH) published 2024-01-31. the CNA's CVSS baseline 8.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:redhat, epss, ghsa
Elevated
8.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 5%CVSS: 8.4Exploit: NoneExposed: 0

A fix is available — apply it.

A 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 the openlog function was not called, or called with the ident argument set to NULL, and the program name (the basename of argv[0]) is bigger than 1024 bytes, resulting in an application crash or local privilege escalation. This issue affects glibc 2.36 and newer.

CVSS v3
8.4
EG Score
8.4(medium)
EG Risk
54(Track*)
EG Risk 54/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity84% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS
91.0%
KEV
Not listed

Published

January 31, 2024

Last Modified

July 14, 2026

Advisory Details (10)

Auto-updated May 12, 2026
🔬 Proof of concept available. Patch available. Sources: redhat.
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20240216-0007/
generic

glibc: Multiple Vulnerabilities (GLSA 202402-01) — Gentoo security

https://security.gentoo.org/glsa/202402-01
generic

[SECURITY] Fedora 38 Update: glibc-2.37-18.fc38 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MWQ6BZJ6CV5UAW4VZSKJ6TO4KIW2KWAQ/
generic

[SECURITY] Fedora 39 Update: glibc-2.38-16.fc39 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/D2FIH77VHY3KCRROCXOT6L27WMZXSJ2G/
redhat

2249053 – (CVE-2023-6246) CVE-2023-6246 glibc: heap-based buffer overflow in __vsyslog_internal()

https://bugzilla.redhat.com/show_bug.cgi?id=2249053
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2023-6246
generic

Full Disclosure: Out-of-bounds read & write in the glibc's qsort()

http://seclists.org/fulldisclosure/2024/Feb/5
generic🟡 PoC Available

Full Disclosure: CVE-2023-6246: Heap-based buffer overflow in the glibc's syslog()

http://seclists.org/fulldisclosure/2024/Feb/3
generic

Packet Storm

http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html
generic

Packet Storm

http://packetstormsecurity.com/files/176931/glibc-qsort-Out-Of-Bounds-Read-Write.html

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntunscd (2.38-1ubuntu6.1) @ mantic2026-05-22ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(2)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 13× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 111 total refreshes for this CVE.

  1. 2026-07-23 14:16 UTCEPSS rescore
  2. 2026-07-23 02:30 UTCEG score recompute
  3. 2026-07-22 23:17 UTCEG score recompute
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  46. 2026-06-05 04:39 UTCOSV refresh
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  71. 2026-05-22 05:00 UTCVendor advisory
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Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2023-6246?
CVE-2023-6246 is a high vulnerability published on January 31, 2024. A 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 the openlog function was not called, or called with the ident argument set to NULL, and the program name (the basename of…
When was CVE-2023-6246 disclosed?
CVE-2023-6246 was first published in the National Vulnerability Database on January 31, 2024, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-6246 actively exploited?
CVE-2023-6246 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 91.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-6246?
CVE-2023-6246 has a CVSS v4.0 base score of 8.4 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2023-6246?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-6246, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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