Critical severity9.8NVD Advisory· Published Feb 3, 2023· Updated Jun 17, 2026

CVE-2023-25135

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Jelsoft/Vbulletin5 versions
cpe:2.3:a:vbulletin:vbulletin:5.6.7:-:*:*:*:*:*:*+ 4 more
- cpe:2.3:a:vbulletin:vbulletin:5.6.7:-:*:*:*:*:*:*
- cpe:2.3:a:vbulletin:vbulletin:5.6.8:-:*:*:*:*:*:*
- cpe:2.3:a:vbulletin:vbulletin:5.6.9:-:*:*:*:*:*:*
- (no CPE)
- (no CPE)range: <5.6.9 PL1

Patches

Vulnerability mechanics

References

www.ambionics.io/blog/vbulletin-unserializable-but-unreachablenvdExploitTechnical DescriptionThird Party Advisory
forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4473890-vbulletin-5-6-9-security-patchnvdRelease NotesVendor Advisory

News mentions

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cvss	0.637
epss	0.019
exploit	0.000
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ransomware	0.000