CVE-2023-4039 — DISPUTED**A failure in the -fstack-protector feature in GCC-based toolchains tha

DISPUTED**A failure in the -fstack-protector feature in GCC-based toolchains that target AArch64 allows an attacker to exploit an existing buffer overflow in dynamically-sized local variables in your application without this being detected. This stack-protector failure only appli

01What is this vulnerability?

DISPUTED**A failure in the -fstack-protector feature in GCC-based toolchains that target AArch64 allows an attacker to exploit an existing buffer overflow in dynamically-sized local variables in your application without this being detected. This stack-protector failure only applies to C99-style dynamically-sized local variables or those created using alloca(). The stack-protector operates as…

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-09-13T09:15:15.690
• Last modified: 2026-10-14T22:17:17.000

09References

• developer.arm.com — https://developer.arm.com/Arm%20Security%20Center/GCC%20Stack%20Protector%20Vuln…
• github.com — https://github.com/metaredteam/external-disclosures/security/advisories/GHSA-x7c…
• developer.arm.com — https://developer.arm.com/Arm%20Security%20Center/GCC%20Stack%20Protector%20Vuln…
• github.com — https://github.com/metaredteam/external-disclosures/security/advisories/GHSA-x7c…
• cert-portal.siemens.com — https://cert-portal.siemens.com/productcert/html/ssa-355557.html
• cert-portal.siemens.com — https://cert-portal.siemens.com/productcert/html/ssa-398330.html