CVE-2023-4813
A public proof of concept exists; no exploitation attested.
- Published2023-09-12
- WeaknessCWE-416
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
A flaw has been identified in glibc. In an uncommon situation, the gaih_inet function may use memory that has been freed, resulting in an application crash. This issue is only exploitable when the getaddrinfo function is called and the hosts database in /etc/nsswitch.conf is configured with SUCCESS=continue or SUCCESS=merge.
Timeline
dates in UTC- 2023-09-1222:15CVE publishedNVD
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-4813?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-4813?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 8.0 | = 8.0 | no fix published | NVD |
| 9.0 | = 9.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 8.8 | = 8.8 | no fix published | NVD |
| 9.2 | = 9.2 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 38.x | = 38 | no fix published | NVD |
13 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- glibcAlmaLinux:9all versions · fixed in 2.34-60.el9_2.7and 214 other packages
- glibcAlmaLinux:8all versions · fixed in 2.28-225.el8_8.6and 213 other packages
Fix
Advisories and patches
- bugzilla.redhat.comPatch
Detection
read 2026-10-23 19:23 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
Sources
- CNACVSS 3.15.9read 2026-10-23
- NVDCVSS 3.15.9read 2026-10-23
- CNAweakness (CWE)CWE-416read 2026-10-23
- NVDweakness (CWE)CWE-416read 2026-10-23
- FIRST EPSSEPSS score2.2 %2026-10-23
- PoC-in-GitHubproof of concept1read 2026-10-23
- OSVaffected packages—
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2023-09-12
- Last Modified
- 2026-10-14
- NVD status
- Modified
Frequently asked questions
What is CVE-2023-4813?
Is CVE-2023-4813 actively exploited?
What is the CVSS score for CVE-2023-4813?
Running glibc? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.