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CVE-2017-12934

25
FAUCET Score

CVE-2017-12934 is a heap use-after-free vulnerability affecting PHP versions 7.0.x before 7.0.21 and 7.1.x before 7.1.7, specifically within the var_unserializer.re component during the deserialization of untrusted data. This vulnerability carries a CVSSv3 score of 7.5 (High), indicating it can be exploited remotely without authentication and has a high potential impact on the integrity of affected PHP installations. Despite its severity, there is no evidence of active exploitation, no known public exploit code (Metasploit, Nuclei, ExploitDB), and minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
7.0.0CPE matchmatch criteria
cpe:2.3:a:php:php:7.0.0:*:*:*:*:*:*:*
7.0.1CPE matchmatch criteria
cpe:2.3:a:php:php:7.0.1:*:*:*:*:*:*:*
7.0.2CPE matchmatch criteria
cpe:2.3:a:php:php:7.0.2:*:*:*:*:*:*:*
7.0.3CPE matchmatch criteria
cpe:2.3:a:php:php:7.0.3:*:*:*:*:*:*:*
7.0.4CPE matchmatch criteria
cpe:2.3:a:php:php:7.0.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.63%
Probability of exploitation in next 30 days
EPSS Percentile
88.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0363 is in the 79th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 6Fixed in: rh-php70-php-0:7.0.27-1.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUSFixed in: rh-php70-php-0:7.0.27-1.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: rh-php70-php-0:7.0.27-1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUSFixed in: rh-php70-php-0:7.0.27-1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUSFixed in: rh-php70-php-0:7.0.27-1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUSFixed in: rh-php70-php-0:7.0.27-1.el7
View patch

Vendor Advisories (1)

redhatCVE-2017-12934Moderate

php: heap use after free in ext/standard/var_unserializer.re

Feb 15, 2017

References

php.net / ChangeLog-7.php
Vendor Advisory
access.redhat.com / errata/RHSA-2018:1296
bugs.php.net / bug.php
Issue TrackingThird Party Advisory
debian.org / security/2018/dsa-4080
securityfocus.com / bid/100428
Third Party AdvisoryVDB Entry