7.5

CVE-2017-12934: php Use After Free

Modified
AliasesUBUNTU-CVE-2017-12934
Published 18-08-2017Last modified 05-08-2024

Vulnerability summary

CVE-2017-12934 is a high (CVSS 7.5) Use After Free vulnerability in php. EPSS estimates a 3.63% chance of exploitation in the next 30 days, higher than 89.5% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 4% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.0 (NVD)
EPSS score
3.63%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 1
DSA-4080-1RHSA-2018:1296SUSE-SU-2017:2468-1

Timeline

  1. 18-08-2017
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

ext/standard/var_unserializer.re in PHP 7.0.x before 7.0.21 and 7.1.x before 7.1.7 is prone to a heap use after free while unserializing untrusted data, related to the zval_get_type function in Zend/zend_types.h. Exploitation of this issue can have an unspecified impact on the integrity of PHP.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

3.63%

Chance of exploitation in the next 30 days

Percentile

90%

Versus all other CVEs

30-day change

No change 0.00 pp

From 3.63% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Php1 product
  • phpEOL7.0.0 | 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
  • php7.0< 7.0.22-0ubuntu0.16.04.1

2 vendors · 2 products

References

7 links