CVE-2017-12933: php Out-of-bounds Read
Vulnerability summary
CVE-2017-12933 is a critical (CVSS 9.8) Out-of-bounds Read vulnerability in php. EPSS estimates a 6.94% chance of exploitation in the next 30 days, higher than 94.1% of scored vulnerabilities.
Severe, CVSS 9.8 (NVD); no exploitation reported by the 5 checked sources; EPSS 7% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 7 · Duplicates 1 · Related 4Timeline
- 18-08-2017PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
The finish_nested_data function in ext/standard/var_unserializer.re in PHP before 5.6.31, 7.0.x before 7.0.21, and 7.1.x before 7.1.7 is prone to a buffer over-read while unserializing untrusted data. Exploitation of this issue can have an unspecified impact on the integrity of PHP.
CVSS metrics
3 scores · 2 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
6.94%
Chance of exploitation in the next 30 days
Percentile
94%
Versus all other CVEs
30-day change
No change 0.00 pp
From 6.94% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Suse3 products
- php5&distro=SUSE Linux Enterprise Module for Web and Scripting 12< 5.5.14-109.8.2
- php5&distro=SUSE Linux Enterprise Software Development Kit 12 SP2< 5.5.14-109.8.2
- php5&distro=SUSE Linux Enterprise Software Development Kit 12 SP3< 5.5.14-109.8.2
Debian1 product
- php5< 5.4.45-0+deb7u11
Php1 product
- phpEOL≤ 5.6.30 | 7.0.0 | 7.0.1 | 7.0.2 | 7.0.3 | 7.0.4 | 7.0.5 | 7.0.6 | 7.0.7 | 7.0.8 | 7.0.9 | 7.0.10 | 7.0.11 | 7.0.12 | 7.0.13 | 7.0.14 | 7.0.15 | 7.0.16 | 7.0.17 | 7.0.18 | 7.0.19 | 7.0.20 | 7.1.0 | 7.1.1 | 7.1.2 | 7.1.3 | 7.1.4 | 7.1.5 | 7.1.6
Ubuntu1 product
- php5< 5.5.9+dfsg-1ubuntu4.23
4 vendors · 6 products
