Deserialization in Vbulletin
CVE-2023-25135
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.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.239 (97.8th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.239 · newest: 0.239 · change: 0.000
Affected products
- Vbulletin — versions 5.6.7, 5.6.8, 5.6.9
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.ambionics.io/blog/vbulletin-unserializable-but-unreachable (Technical Description, Exploit, Third Party Advisory)
- forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/44… (Release Notes, Vendor Advisory)
Frequently asked questions
- What is CVE-2023-25135?
- CVE-2023-25135 is a critical-severity vulnerability in Vbulletin, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2023-02-03.
- How severe is CVE-2023-25135?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2023-25135 known to be exploited?
- 10 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.