CVE-2017-17672
In vBulletin through 5.3.x, there is an unauthenticated deserialization vulnerability that leads to arbitrary file deletion and, under certain circumstances, code execution, because of unsafe usage of PHP's unserialize() in vB_Library_Template's…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 15.2%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.
Description
In vBulletin through 5.3.x, there is an unauthenticated deserialization vulnerability that leads to arbitrary file deletion and, under certain circumstances, code execution, because of unsafe usage of PHP's unserialize() in vB_Library_Template's cacheTemplates() function, which is a publicly exposed API. This is exploited with the templateidlist parameter to ajax/api/template/cacheTemplates.
- CVSS 3.0
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 15.19% probability · 97th percentile
- Public exploits
- 1 in Exploit-DB · first 13 December 2017
- CISA KEV
- Not listed
- Weakness
- CWE-502
- Affected
- vbulletin/vbulletin
- Source
- cve@mitre.org
EPSS moved from 11.1% on 21 September 2026 to 15.2% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- https://blogs.securiteam.com/index.php/archives/3573Exploit, Third Party Advisory
- https://www.exploit-db.com/exploits/43362/Exploit, Third Party Advisory, VDB Entry
- https://blogs.securiteam.com/index.php/archives/3573Exploit, Third Party Advisory
- https://www.exploit-db.com/exploits/43362/Exploit, Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.