No exploitation reported

CVE-2017-12934

No exploitation reported by the sources we read.

Published2017-08-18
WeaknessCWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2017-08-1803:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-12934?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-12934?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

PHP

Branch	Affected	Fixed in	Source
7.0	= 7.0.0	no fix published	NVD
7.0	= 7.0.1	no fix published	NVD
7.0	= 7.0.2	no fix published	NVD
7.0	= 7.0.3	no fix published	NVD
7.0	= 7.0.4	no fix published	NVD
7.0	= 7.0.5	no fix published	NVD
7.0	= 7.0.6	no fix published	NVD
7.0	= 7.0.7	no fix published	NVD
7.0	= 7.0.8	no fix published	NVD
7.0	= 7.0.9	no fix published	NVD
7.0	= 7.0.10	no fix published	NVD
7.0	= 7.0.11	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

php.netVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.07.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-416read 2026-10-23
FIRST EPSSEPSS score3.6 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published: 2017-08-18
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2017-12934?

Is CVE-2017-12934 actively exploited?

Active exploitation of CVE-2017-12934 has not been confirmed. Its EPSS score was 3.6% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-12934?

CVE-2017-12934 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

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