GNU C Library Buffer Overflow Vulnerability
GNU C Library's dynamic loader ld.so contains a buffer overflow vulnerability when processing the GLIBC_TUNABLES environment variable, allowing a local attacker to execute code with elevated privileges.
- Vendor
- GNU
- Product
- GNU C Library
- CVSS
- 7.8
- EPSS (exploit probability)
- 63.8%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2023-4911 being exploited?
Yes. CISA added CVE-2023-4911 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 63.8% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-23. Full cross-catalog view: /kev-comparison
CVE-2023-4911 timeline
Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON
What to do
CISA required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
US federal civilian agencies must remediate by (21 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other GNU CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2026-24061 GNU InetUtils Argument Injection Vulnerability | [ CRITICAL ] | 9.8 | 99.0% | |
| CVE-2014-6278 GNU Bash OS Command Injection Vulnerability | [ HIGH ] | 8.8 | 99.6% | |
| CVE-2014-7169 GNU Bourne-Again Shell (Bash) Arbitrary Code Execution Vulnerability | [ CRITICAL ] | 9.8 | 99.9% | |
| CVE-2014-6271 GNU Bourne-Again Shell (Bash) Arbitrary Code Execution Vulnerability | [ CRITICAL ] | 9.8 | 100.0% |