CVE catalog
CVE-2015-6835
UBUNTU-CVE-2015-6835
- Severity
- Critical · CVSS 9.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 36.16% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Ubuntu | php5 | 14.04 | 5.5.3+dfsg-1ubuntu2 | vulnerable |
| Ubuntu | php5 | 14.04 | 5.5.3+dfsg-1ubuntu3 | vulnerable |
| Ubuntu | php5 | 14.04 | 5.5.6+dfsg-1ubuntu1 | vulnerable |
| Ubuntu | php5 | 14.04 | 5.5.6+dfsg-1ubuntu2 | vulnerable |
| Ubuntu | php5 | 14.04 | 5.5.8+dfsg-2ubuntu1 | vulnerable |
| Ubuntu | php5 | 14.04 | 5.5.9+dfsg-1ubuntu1 | vulnerable |
| Ubuntu | php5 | 14.04 | 5.5.9+dfsg-1ubuntu2 | vulnerable |
| Ubuntu | php5 | 14.04 | 5.5.9+dfsg-1ubuntu3 | vulnerable |
| Ubuntu | php5 | 14.04 | 5.5.9+dfsg-1ubuntu4 | vulnerable |
| Ubuntu | php5 | 14.04 | 5.5.9+dfsg-1ubuntu4.1 | vulnerable |
| Ubuntu | php5 | 14.04 | 5.5.9+dfsg-1ubuntu4.2 | vulnerable |
| Ubuntu | php5 | 14.04 | 5.5.9+dfsg-1ubuntu4.3 | vulnerable |
| Ubuntu | php5 | 14.04 | 5.5.9+dfsg-1ubuntu4.4 | vulnerable |
| Ubuntu | php5 | 14.04 | 5.5.9+dfsg-1ubuntu4.5 | vulnerable |
| Ubuntu | php5 | 14.04 | 5.5.9+dfsg-1ubuntu4.6 | vulnerable |
| Ubuntu | php5 | 14.04 | 5.5.9+dfsg-1ubuntu4.7 | vulnerable |
| Ubuntu | php5 | 14.04 | 5.5.9+dfsg-1ubuntu4.9 | vulnerable |
| Ubuntu | php5 | 14.04 | 5.5.9+dfsg-1ubuntu4.11 | vulnerable |
| Ubuntu | php5 | 14.04 | 5.5.9+dfsg-1ubuntu4.12 | vulnerable |
| Ubuntu | php5 | 14.04 | 5.5.9+dfsg-1ubuntu4.13 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Ubuntu | php5 | deb | 14.04 | 5.5.9+dfsg-1ubuntu4.13 | Not reported | UBUNTU-CVE-2015-6835 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2015_1633-1.json]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2015-6835]
- [https://security.access.redhat.com/data/csaf/v2/vex/2015/cve-2015-6835.json]
[FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]