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Out-of-bounds ReadWeakness · CWE-125

CVE-2025-9232

MEDIUM · 5.9 CVSS v3.1 Published 2025-09-30
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-125

The code reads past the end (or before the start) of a buffer, returning memory that was never meant to be exposed. Attackers use it to leak secrets like keys or to defeat memory-protection defences. Remediation is validating indices and lengths before every read.

General guidance for the out-of-bounds read class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix High confidence

Latest patch release of your current OpenSSL 3.x branch (e.g., 3.0.17+, 3.1.9+, 3.2.5+, 3.3.4+, 3.4.1+, or 3.5.1+)

  1. 1. Identify the currently installed OpenSSL version using `openssl version` or checking package manager
  2. 2. Determine which OpenSSL 3.x branch you are using (e.g., 3.0.x, 3.1.x, 3.2.x, 3.3.x, 3.4.x, or 3.5.x)
  3. 3. Upgrade OpenSSL to the latest patch release for your branch that includes the fix for CVE-2025-9232
  4. 4. For OpenSSL 3.0.x: upgrade to version 3.0.17 or later
  5. 5. For OpenSSL 3.1.x: upgrade to version 3.1.9 or later
  6. 6. For OpenSSL 3.2.x: upgrade to version 3.2.5 or later
  7. 7. For OpenSSL 3.3.x: upgrade to version 3.3.4 or later
  8. 8. For OpenSSL 3.4.x: upgrade to version 3.4.1 or later
Caveat OpenSSL patch releases are generally backward compatible; however, verify application compatibility with the specific OpenSSL version

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-9232 in production — separate from our analysis above.

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