VulnerabilityModified

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 execute arbitrary code via vectors related to (1) the Serializable interface, (2) the SplObjectStorage class, and (3)…

EXPLOIT ×2 ✓CRITICAL 9.8EPSS 46.8%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 46.8%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.

Description

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: 46.80% probability · 99th percentile
Public exploits: 2 in Exploit-DB · verified · first 9 September 2015
CISA KEV: Not listed
Affected: php/php
Source: security@opentext.com

EPSS trend

EPSS moved from 42.6% on 21 September 2026 to 46.8% on 4 November 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.

Public exploits (2)

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.

EDB-ID	Title	Type	Published	Verified
EDB-38122 source ↗	PHP 5.4/5.5/5.6 - SplObjectStorage 'Unserialize()' Use-After-Freephp · Taoguang Chen	dos	9 September 2015	yes
EDB-38120 source ↗	PHP 5.4/5.5/5.6 - SplDoublyLinkedList 'Unserialize()' Use-After-Freephp · Taoguang Chen	dos	9 September 2015	yes

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.