How severe is CVE-2023-25135?

CVE-2023-25135 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2023-25135?

Affected package information for CVE-2023-25135 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2023-25135?

No fixed version has been published for CVE-2023-25135 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2023-25135 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2023-25135, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2023-25135?

CVE-2023-25135 has an EPSS (Exploit Prediction Scoring System) score of 93.3%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

What type of vulnerability is CVE-2023-25135?

CVE-2023-25135 is classified as Deserialization of Untrusted Data (CWE-502). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

Which products and versions are affected by CVE-2023-25135?

CVE-2023-25135 affects vbulletin vbulletin (3 versions, e.g. 5.6.7, 5.6.8, 5.6.9). Check the affected-products list on this page against your deployed version to confirm exposure.

Is there exploit tooling available for CVE-2023-25135?

A Nuclei detection template exists for CVE-2023-25135, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2023-25135 published, and has it been updated?

CVE-2023-25135 was published on February 3, 2023 and was last updated on March 26, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2023-25135

CRITICAL

vBulletin before 5.6.9 PL1 allows an unauthenticated remote attacker to execute arbitrary code via a crafted HTTP request that triggers deserialization. This occurs because verify_serialized…

Published

Feb 3, 2023

Updated

Mar 26, 2025

Affected

0 pkgs

Patched

None yet

Exploits

1 known

EPSS Exploitation Probability

via FIRST.org ↗

93.3%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

vBulletin before 5.6.9 PL1 allows an unauthenticated remote attacker to execute arbitrary code via a crafted HTTP request that triggers deserialization. This occurs because verify_serialized checks that a value is serialized by calling unserialize and then checking for errors. The fixed versions are 5.6.7 PL1, 5.6.8 PL1, and 5.6.9 PL1.

Affected Products

1 product · 3 configurations

Application

vbulletinvbulletin

3 versions

5.6.75.6.85.6.9

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

vBulletin before 5.6.9 PL1 allows an unauthenticated remote attacker to …

ambionics.ioNVDFeb 2023

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2023-25135 in your stack?

O3 detects CVE-2023-25135 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works