CVE-2025-9232
Description
Issue summary: An application using the OpenSSL HTTP client API functions may trigger an out-of-bounds read if the 'no_proxy' environment variable is set and the host portion of the authority component of the HTTP URL is an IPv6 address. Impact summary: An out-of-bounds read can trigger a crash which leads to Denial of Service for an application. The OpenSSL HTTP client API functions can be used directly by applications but they are also used by the OCSP client functions and CMP (Certificate Management Protocol) client implementation in OpenSSL. However the URLs used by these implementations are unlikely to be controlled by an attacker. In this vulnerable code the out of bounds read can only trigger a crash. Furthermore the vulnerability requires an attacker-controlled URL to be passed from an application to the OpenSSL function and the user has to have a 'no_proxy' environment variable set. For the aforementioned reasons the issue was assessed as Low severity. The vulnerable code was introduced in the following patch releases: 3.0.16, 3.1.8, 3.2.4, 3.3.3, 3.4.0 and 3.5.0. The FIPS modules in 3.5, 3.4, 3.3, 3.2, 3.1 and 3.0 are not affected by this issue, as the HTTP client implementation is outside the OpenSSL FIPS module boundary.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 3.5.1-1+deb13u1 |
| sid | Fixed | 3.5.4-1 |
| forky | Fixed | 3.5.4-1 |
| bullseye | Fixed | 0 |
| bookworm | Fixed | 3.0.17-1~deb12u3 |
References
- https://github.com/openssl/openssl/commit/2b4ec20e47959170422922eaff25346d362dcb35
- https://github.com/openssl/openssl/commit/654dc11d23468a74fc8ea4672b702dd3feb7be4b
- https://github.com/openssl/openssl/commit/7cf21a30513c9e43c4bc3836c237cf086e194af3
- https://github.com/openssl/openssl/commit/89e790ac431125a4849992858490bed6b225eadf
- https://github.com/openssl/openssl/commit/bbf38c034cdabd0a13330abcc4855c866f53d2e0
- https://openssl-library.org/news/secadv/20250930.txt
- http://www.openwall.com/lists/oss-security/2025/09/30/5
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://cert-portal.siemens.com/productcert/html/ssa-089022.html
- https://cert-portal.siemens.com/productcert/html/ssa-485750.html
- https://www.suse.com/security/cve/CVE-2025-9232.html
- https://security-tracker.debian.org/tracker/CVE-2025-9232
- https://cert-portal.siemens.com/productcert/html/ssa-253495.html
CWEs
CWE-125
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.