CVE-2025-9232: Out-of-bounds read in HTTP client no_proxy handling

Medium severity · published Sep 30, 2025

CVE-2025-9232

Out-of-bounds read in HTTP client no_proxy handling

5.9

CVSS

EPSS

On KEV

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.

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack vector

Network

Complexity

High

Privileges

None

User interaction

None

Confidentiality

None

Integrity

None

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)2.0% · higher than 81% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

OpenSSL · OpenSSL

3.5.0 before 3.5.4; 3.4.0 before 3.4.3; 3.3.3 before 3.3.5; 3.2.4 before 3.2.6; 3.0.16 before 3.0.18 · source: vendor

RUGGEDCOM RST2428P · Siemens

before V3.3; before V4.0 · source: CISA

SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family · Siemens

before V3.3 · source: CISA

SCALANCE XCH328 · Siemens

before V3.3 · source: CISA

SCALANCE XCM324 · Siemens

before V3.3 · source: CISA

SCALANCE XCM328 · Siemens

before V3.3 · source: CISA

SCALANCE XCM332 · Siemens

before V3.3 · source: CISA

SCALANCE XRH334 (24 V DC, 8xFO, CC) · Siemens

before V3.3 · source: CISA

SCALANCE XRM334 (230 V AC, 12xFO) · Siemens

before V3.3 · source: CISA

SCALANCE XRM334 (230 V AC, 8xFO) · Siemens

before V3.3 · source: CISA

SCALANCE XRM334 (230V AC, 2x10G, 24xSFP, 8xSFP+) · Siemens

before V3.3 · source: CISA

SCALANCE XRM334 (24 V DC, 12xFO) · Siemens

before V3.3 · source: CISA

In the news

VulnerabilityCritical

Siemens SIDIS Prime

View CSAF Summary SIDIS Prime before V4.0.800 is affected by multiple vulnerabilities in the components OpenSSL, SQLite, and several Node.js packages as described below. Siemens has released a new version of SIDIS Prime and recommends to update to the latest version. The following versions of Siemens SIDIS Prime are affected: SIDIS Prime vers:intdot/<4.0.800 (CVE-2024-29857, CVE-2024-30171, CVE-2024-30172, CVE-2024-41996, CVE-2025-6965, CVE-2025-7783, CVE-2025-9230, CVE-2025-9232, CVE-2025-9670, CVE-2025-12816, CVE-2025-15284, CVE-2025-58751, CVE-2025-58752, CVE-2025-58754, CVE-2025-62522, CVE-2025-64718, CVE-2025-64756, CVE-2025-66030, CVE-2025-66031, CVE-2025-66035, CVE-2025-66412, CVE-2025-69277, CVE-2026-22610) CVSS Vendor Equipment Vulnerabilities v3 8.7 Siemens Siemens SIDIS Prime Out-of-bounds Read, Observable Discrepancy, Improper Input Validation, Improper Certificate Validation, Numeric Truncation Error, Use of Insufficiently Random Values, Out-of-bounds Write, Inefficient Regular Expression Complexity, Interpretation Conflict, Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), Relative Path Traversal, Allocation of Resources Without Limits or Throttling, Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution'), Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'), Integer Overflow or Wraparound, Uncontrolled Recursio...

CVE-2024-29857 CVE-2024-30171 CVE-2024-30172

Mar 12, 2026·CISA Advisories

VulnerabilityHigh

Siemens SINEC OS

View CSAF Summary SINEC OS before V3.3 contains third-party components with multiple vulnerabilities. Siemens has released new versions for the affected products and recommends to update to the latest versions. The following versions of Siemens SINEC OS are affected: RUGGEDCOM RST2428P (6GK6242-6PA00) vers:intdot/<3.3 (CVE-2022-48174, CVE-2023-7256, CVE-2023-39810, CVE-2023-42363, CVE-2023-42364, CVE-2023-42365, CVE-2023-42366, CVE-2024-6197, CVE-2024-6874, CVE-2024-7264, CVE-2024-8006, CVE-2024-8096, CVE-2024-9681, CVE-2024-11053, CVE-2024-12718, CVE-2024-41996, CVE-2024-47619, CVE-2024-52533, CVE-2025-0167, CVE-2025-0665, CVE-2025-0725, CVE-2025-1390, CVE-2025-3360, CVE-2025-4138, CVE-2025-4330, CVE-2025-4373, CVE-2025-4435, CVE-2025-4516, CVE-2025-4517, CVE-2025-6141, CVE-2025-9086, CVE-2025-9230, CVE-2025-9231, CVE-2025-9232, CVE-2025-10148, CVE-2025-27587, CVE-2025-32433, CVE-2025-38084, CVE-2025-38085, CVE-2025-38086, CVE-2025-38345, CVE-2025-38350, CVE-2025-38498, CVE-2025-39839, CVE-2025-39841, CVE-2025-39846, CVE-2025-39853, CVE-2025-39860, CVE-2025-39864, CVE-2025-39865, CVE-2025-59375) SCALANCE XCH328 (6GK5328-4TS01-2EC2) vers:intdot/<3.3 (CVE-2022-48174, CVE-2023-7256, CVE-2023-39810, CVE-2023-42363, CVE-2023-42364, CVE-2023-42365, CVE-2023-42366, CVE-2024-6197, CVE-2024-6874, CVE-2024-7264, CVE-2024-8006, CVE-2024-8096, CVE-2024-9681, CVE-2024-11053, CVE-2024-12718, CVE-2024-41996, CVE-2024-47619, CVE-2024-52533, CVE-2025-0167, CVE-2025-0665...

CVE-2022-48174 CVE-2023-7256 CVE-2023-39810

Feb 12, 2026·CISA Advisories

Affected product

OpenSSL

All OpenSSL CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2025-9232

CVE.org

https://www.cve.org/CVERecord?id=CVE-2025-9232

github.com

https://github.com/openssl/openssl/commit/2b4ec20e47959170422922eaff25346d362dcb35