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CVE-2023-25135

54
FAUCET Score

CVE-2023-25135 is a critical deserialization vulnerability affecting vBulletin versions prior to 5.6.9 PL1. An unauthenticated remote attacker can exploit this flaw by sending a crafted HTTP request, leading to arbitrary code execution. With a CVSS score of 9.8 (Critical) and an EPSS score indicating high exploitability, this vulnerability poses a significant risk. While not currently on the CISA KEV catalog, Nuclei templates exist for pre-authentication RCE, and it has garnered community discussion and media coverage, suggesting potential for future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
5.6.7CPE matchmatch criteria
cpe:2.3:a:vbulletin:vbulletin:5.6.7:-:*:*:*:*:*:*
5.6.8CPE matchmatch criteria
cpe:2.3:a:vbulletin:vbulletin:5.6.8:-:*:*:*:*:*:*
5.6.9CPE matchmatch criteria
cpe:2.3:a:vbulletin:vbulletin:5.6.9:-:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
23.93%
Probability of exploitation in next 30 days
EPSS Percentile
97.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Nuclei: CVE-2023-25135 · May 9, 2023
This CVE's current EPSS score of 0.2393 is in the 94th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

forum.vbulletin.com / forum/vbulletin-announcements/vbulletin-announcements_aa/4473890-vbulletin-5-6-9-security-patch
Release NotesVendor Advisory
ambionics.io / blog/vbulletin-unserializable-but-unreachable
ExploitTechnical DescriptionThird Party Advisory