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.
Published: 2025-09-30
Score: 5.9 Medium
EPSS: 2.2% Low
KEV: No
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No solution or workaround provided in the CVE record.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories
Source ID Title
Debian DSA Debian DSA DSA-6015-1 openssl security update
EUVD EUVD EUVD-2025-31727 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.
Ubuntu USN Ubuntu USN USN-7786-1 OpenSSL vulnerabilities
Ubuntu USN Ubuntu USN USN-7894-1 EDK II vulnerabilities
History

Mon, 09 Nov 2026 21:15:00 +0000

Type Values Removed Values Added
First Time appeared Siemens
Siemens ruggedcom Rst2428p
Siemens ruggedcom Rst2428p Firmware
Siemens scalance Xc316-8
Siemens scalance Xc319-4
Siemens scalance Xc324-4
Siemens scalance Xc324-4eec
Siemens scalance Xc332
Siemens scalance Xc416-8
Siemens scalance Xc419-4
Siemens scalance Xc424-4
Siemens scalance Xc432
Siemens scalance Xch328
Siemens scalance Xcm324
Siemens scalance Xcm328
Siemens scalance Xcm332
Siemens scalance Xr302-32
Siemens scalance Xr322-12
Siemens scalance Xr326-8
Siemens scalance Xr326-8eec
Siemens scalance Xr502-32
Siemens scalance Xr522-12
Siemens scalance Xr524-8c
Siemens scalance Xr524-8wg
Siemens scalance Xr526-8
Siemens scalance Xr526-8c
Siemens scalance Xr528-6m
Siemens scalance Xr552-12m
Siemens scalance Xrh334
Siemens scalance Xrm334
Siemens sidis Prime
Siemens sidis Secured Smartplug
Siemens sidis Secured Smartplug Firmware
Siemens simatic Cn 4100
Siemens simatic Cn 4100 Firmware
Siemens simatic S7-1500 Cpu 1518-4 Pn\/dp Mfp
Siemens simatic S7-1500 Cpu 1518-4 Pn\/dp Mfp Firmware
Siemens simatic S7-1500 Cpu 1518f-4 Pn\/dp Mfp
Siemens simatic S7-1500 Cpu 1518f-4 Pn\/dp Mfp Firmware
Siemens sinec Os
Siemens siplus S7-1500 Cpu 1518-4 Pn\/dp Mfp
Siemens siplus S7-1500 Cpu 1518-4 Pn\/dp Mfp Firmware
CPEs cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
cpe:2.3:a:siemens:sidis_prime:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:ruggedcom_rst2428p:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xc316-8:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xc319-4:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xc324-4:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xc324-4eec:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xc332:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xc416-8:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xc419-4:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xc424-4:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xc432:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xch328:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xcm324:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xcm328:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xcm332:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xr302-32:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xr322-12:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xr326-8:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xr326-8eec:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xr502-32:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xr522-12:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xr524-8c:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xr524-8wg:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xr526-8:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xr526-8c:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xr528-6m:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xr552-12m:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xrh334:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_xrm334:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:sidis_secured_smartplug:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_cn_4100:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_s7-1500_cpu_1518-4_pn\/dp_mfp:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_s7-1500_cpu_1518f-4_pn\/dp_mfp:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:siplus_s7-1500_cpu_1518-4_pn\/dp_mfp:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:ruggedcom_rst2428p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sidis_secured_smartplug_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_cn_4100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware:3.1.5:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_s7-1500_cpu_1518f-4_pn\/dp_mfp_firmware:3.1.5:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinec_os:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siplus_s7-1500_cpu_1518-4_pn\/dp_mfp_firmware:3.1.5:*:*:*:*:*:*:*
Vendors & Products Siemens
Siemens ruggedcom Rst2428p
Siemens ruggedcom Rst2428p Firmware
Siemens scalance Xc316-8
Siemens scalance Xc319-4
Siemens scalance Xc324-4
Siemens scalance Xc324-4eec
Siemens scalance Xc332
Siemens scalance Xc416-8
Siemens scalance Xc419-4
Siemens scalance Xc424-4
Siemens scalance Xc432
Siemens scalance Xch328
Siemens scalance Xcm324
Siemens scalance Xcm328
Siemens scalance Xcm332
Siemens scalance Xr302-32
Siemens scalance Xr322-12
Siemens scalance Xr326-8
Siemens scalance Xr326-8eec
Siemens scalance Xr502-32
Siemens scalance Xr522-12
Siemens scalance Xr524-8c
Siemens scalance Xr524-8wg
Siemens scalance Xr526-8
Siemens scalance Xr526-8c
Siemens scalance Xr528-6m
Siemens scalance Xr552-12m
Siemens scalance Xrh334
Siemens scalance Xrm334
Siemens sidis Prime
Siemens sidis Secured Smartplug
Siemens sidis Secured Smartplug Firmware
Siemens simatic Cn 4100
Siemens simatic Cn 4100 Firmware
Siemens simatic S7-1500 Cpu 1518-4 Pn\/dp Mfp
Siemens simatic S7-1500 Cpu 1518-4 Pn\/dp Mfp Firmware
Siemens simatic S7-1500 Cpu 1518f-4 Pn\/dp Mfp
Siemens simatic S7-1500 Cpu 1518f-4 Pn\/dp Mfp Firmware
Siemens sinec Os
Siemens siplus S7-1500 Cpu 1518-4 Pn\/dp Mfp
Siemens siplus S7-1500 Cpu 1518-4 Pn\/dp Mfp Firmware

Tue, 02 Jun 2026 14:30:00 +0000

Type Values Removed Values Added
References

Tue, 12 May 2026 13:30:00 +0000


Tue, 04 Nov 2025 22:30:00 +0000

Type Values Removed Values Added
References

Thu, 02 Oct 2025 09:00:00 +0000

Type Values Removed Values Added
First Time appeared Openssl
Openssl openssl
Vendors & Products Openssl
Openssl openssl

Wed, 01 Oct 2025 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Low


Tue, 30 Sep 2025 20:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 30 Sep 2025 13:30:00 +0000

Type Values Removed Values Added
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.
Title Out-of-bounds read in HTTP client no_proxy handling
Weaknesses CWE-125
References

Subscriptions

Openssl Openssl
Siemens Ruggedcom Rst2428p Ruggedcom Rst2428p Firmware Scalance Xc316-8 Scalance Xc319-4 Scalance Xc324-4 Scalance Xc324-4eec Scalance Xc332 Scalance Xc416-8 Scalance Xc419-4 Scalance Xc424-4 Scalance Xc432 Scalance Xch328 Scalance Xcm324 Scalance Xcm328 Scalance Xcm332 Scalance Xr302-32 Scalance Xr322-12 Scalance Xr326-8 Scalance Xr326-8eec Scalance Xr502-32 Scalance Xr522-12 Scalance Xr524-8c Scalance Xr524-8wg Scalance Xr526-8 Scalance Xr526-8c Scalance Xr528-6m Scalance Xr552-12m Scalance Xrh334 Scalance Xrm334 Sidis Prime Sidis Secured Smartplug Sidis Secured Smartplug Firmware Simatic Cn 4100 Simatic Cn 4100 Firmware Simatic S7-1500 Cpu 1518-4 Pn\/dp Mfp Simatic S7-1500 Cpu 1518-4 Pn\/dp Mfp Firmware Simatic S7-1500 Cpu 1518f-4 Pn\/dp Mfp Simatic S7-1500 Cpu 1518f-4 Pn\/dp Mfp Firmware Sinec Os Siplus S7-1500 Cpu 1518-4 Pn\/dp Mfp Siplus S7-1500 Cpu 1518-4 Pn\/dp Mfp Firmware
cve-icon MITRE

Status: PUBLISHED

Assigner: openssl

Published:

Updated: 2026-10-15T01:02:23.968Z

Reserved: 2025-08-20T08:38:12.019Z

Link: CVE-2025-9232

cve-icon Vulnrichment

Updated: 2025-11-04T21:15:19.948Z

cve-icon NVD

Status : Analyzed

Published: 2025-09-30T14:15:41.313

Modified: 2026-11-09T21:02:53.390

Link: CVE-2025-9232

cve-icon Redhat

Severity : Low

Publid Date: 2025-09-30T23:59:00Z

Links: CVE-2025-9232 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-10-02T08:46:19Z

Weaknesses