UBUNTU-CVE-2015-6835

Advisory lineage Upstream: 1 Downstream: 1
Upstream
CVE-2015-6835
Downstream
USN-2758-1
Published: 09 Sept 2015, 00:00
Last modified:22 Apr 2026, 10:17

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.8 CRITICAL
3.0 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

09 Sept 2015, 00:00
Published
Vulnerability first disclosed
22 Apr 2026, 10:17
Last Modified
Vulnerability information updated

Description

The session deserializer in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13 mishandles multiple php_var_unserialize calls, which allow remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via crafted session content.

CVSS Metrics

  • v3.0•CRITICAL•Score: 9.8CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Systems

  • ubuntu•php5

    < 5.5.9+dfsg-1ubuntu4.13

References (4)