CVE-2025-9232: OpenSSL

Medium severity, CVSS 5.9. EPSS: 2% chance of exploitation in the next 30 days.

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 products

  • OpenSSL OpenSSL: from 3.5.0, before 3.5.4 (fixed in 3.5.4); from 3.4.0, before 3.4.3 (fixed in 3.4.3); from 3.3.3, before 3.3.5 (fixed in 3.3.5); from 3.2.4, before 3.2.6 (fixed in 3.2.6); from 3.0.16, before 3.0.18 (fixed in 3.0.18)
  • Siemens Ruggedcom RST2428P: before V3.3 (fixed in V3.3); before V4.0 (fixed in V4.0)
  • Siemens Scalance Xc-300/xr-300/xc-400/xr-500wg/xr-500 Family: before V3.3 (fixed in V3.3)
  • Siemens Scalance XCH328: before V3.3 (fixed in V3.3)
  • Siemens Scalance XCM324: before V3.3 (fixed in V3.3)
  • Siemens Scalance XCM328: before V3.3 (fixed in V3.3)
  • Siemens Scalance XCM332: before V3.3 (fixed in V3.3)
  • Siemens Scalance XRH334 24 V Dc, 8xfo, Cc: before V3.3 (fixed in V3.3)
  • Siemens Scalance XRM334 230 V Ac, 12xfo: before V3.3 (fixed in V3.3)
  • Siemens Scalance XRM334 230 V Ac, 8xfo: before V3.3 (fixed in V3.3)
  • Siemens Scalance XRM334 230v Ac, 2x10g, 24xsfp, 8xsfp+: before V3.3 (fixed in V3.3)
  • Siemens Scalance XRM334 24 V Dc, 12xfo: before V3.3 (fixed in V3.3)
  • Siemens Scalance XRM334 24 V Dc, 8xfo: before V3.3 (fixed in V3.3)
  • Siemens Scalance XRM334 24v Dc, 2x10g, 24xsfp, 8xsfp+: before V3.3 (fixed in V3.3)
  • Siemens Scalance XRM334 2x230 V Ac, 12xfo: before V3.3 (fixed in V3.3)
  • Siemens Scalance XRM334 2x230 V Ac, 8xfo: before V3.3 (fixed in V3.3)
  • Siemens Scalance XRM334 2x230v Ac, 2x10g, 24xsfp, 8xsfp+: before V3.3 (fixed in V3.3)
  • Siemens Sidis Prime: before V4.0.800 (fixed in V4.0.800)
  • Siemens Sidis Secured Smartplug: before V7.26.0310 (fixed in V7.26.0310)
  • Siemens SIMATIC Cn 4100: before V5.0 (fixed in V5.0)
  • Siemens SIMATIC s7-1500 CPU 1518-4 Pn/dp Mfp: from V3.1.5
  • Siemens SIMATIC s7-1500 CPU 1518f-4 Pn/dp Mfp: from V3.1.5
  • Siemens Siplus s7-1500 CPU 1518-4 Pn/dp Mfp: from V3.1.5

Published 2025-09-30. Last modified 2026-07-14.