CVE-2015-6834
Multiple use-after-free vulnerabilities in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13 allow remote attackers to…
- 9.8CriticalCVSS base score
- 46.8%Exploitation in 30 daysEPSS · top 1.2% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- 2Public exploitsMetasploit, Nuclei and Exploit-DB
Description
Multiple use-after-free vulnerabilities in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13 allow remote attackers to execute arbitrary code via vectors related to (1) the Serializable interface, (2) the SplObjectStorage class, and (3) the SplDoublyLinkedList class, which are mishandled during unserialization.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list 2 Exploit-DB entries for it.
Show the exploits2
Exploit-DB2 entries
- PHP 5.4/5.5/5.6 - SplDoublyLinkedList 'Unserialize()' Use-After-Free (Exploit-DB entry) (opens in a new tab)
EDB-ID 38120dos, phppublished 9 Sept 2015Verified
- PHP 5.4/5.5/5.6 - SplObjectStorage 'Unserialize()' Use-After-Free (Exploit-DB entry) (opens in a new tab)
EDB-ID 38122dos, phppublished 9 Sept 2015Verified
Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from
Timeline
ID reserved
By microfocus
- 8 months later
· 8 months later
Published
- 8 years later
· 8 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | Critical9.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 46.8% · top 1.2% of all CVEs (10 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
n/a
- affected n/a
References
8
- https://bugs.php.net/bug.php?id=70366 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 1033548 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- 76649 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- http://php.net/ChangeLog-5.php (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://bugs.php.net/bug.php?id=70365 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://bugs.php.net/bug.php?id=70172 (opens in a new tab)x_refsource_CONFIRMx_transferred
- DSA-3358 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- GLSA-201606-10 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2015-6770 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2015-6834)Record last updated .