Vulnerability · Published Sep 30, 2025 · Assigned by openssl
CVE-2025-9232Out-of-bounds read in HTTP client no_proxy handling
Medium 5.9
In plain English
A medium-severity out-of-bounds read in OpenSSL from OpenSSL. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.0% (higher than 81% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | openssl | 3.3.5-r0 | ALPINE-CVE-2025-9232 |
| Alpine:v3.21 | openssl | 3.3.5-r0 | ALPINE-CVE-2025-9232 |
| Alpine:v3.22 | openssl | 3.5.4-r0 | ALPINE-CVE-2025-9232 |
| Alpine:v3.23 | openssl | 3.5.4-r0 | ALPINE-CVE-2025-9232 |
| Alpine:v3.24 | openssl | 3.5.4-r0 | ALPINE-CVE-2025-9232 |
| Debian:12 | openssl | 3.0.17-1~deb12u3 | DEBIAN-CVE-2025-9232 |
| Debian:12 | openssl | 3.0.17-1~deb12u3 | DSA-6015-1 |
| Debian:13 | openssl | 3.5.1-1+deb13u1 | DSA-6015-1 |
| Debian:13 | openssl | 3.5.1-1+deb13u1 | DEBIAN-CVE-2025-9232 |
| Debian:14 | openssl | 3.5.4-1 | DEBIAN-CVE-2025-9232 |
| Ubuntu:22.04:LTS | edk2 | 2022.02-3ubuntu0.22.04.4 | USN-7894-1 |
| Ubuntu:24.04:LTS | edk2 | 2024.02-2ubuntu0.6 | USN-7894-1 |
| Ubuntu:25.10 | edk2 | 2025.02-8ubuntu3 | UBUNTU-CVE-2025-9232 |
| Ubuntu:26.04:LTS | edk2 | 2025.02-8ubuntu3 | UBUNTU-CVE-2025-9232 |
| Ubuntu:22.04:LTS | openssl | 3.0.2-0ubuntu1.20 | USN-7786-1 |
| Ubuntu:24.04:LTS | openssl | 3.0.13-0ubuntu3.6 | USN-7786-1 |
| Ubuntu:25.10 | openssl | 3.5.3-1ubuntu2 | UBUNTU-CVE-2025-9232 |
| Ubuntu:26.04:LTS | openssl | 3.5.3-1ubuntu2 | UBUNTU-CVE-2025-9232 |
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- OpenSSL Advisory vendor-advisory
- 3.5.4 git commit patch
- 3.4.3 git commit patch
- 3.3.5 git commit patch
- 3.2.6 git commit patch
- 3.0.18 git commit patch
- http://www.openwall.com/lists/oss-security/2025/09/30/5
- 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://cert-portal.siemens.com/productcert/html/ssa-032379.html
- https://cert-portal.siemens.com/productcert/html/ssa-253495.html
- https://cert-portal.siemens.com/productcert/html/ssa-585531.html