No exploitation reportedFix available

CVE-2016-5399

Q: Is CVE-2016-5399 actively exploited?

Active exploitation of CVE-2016-5399 has not been confirmed. Its EPSS score was 9.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2016-5399?

CVE-2016-5399 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2017-04-21
Fixed in7.0.9 · 5.6.24
WeaknessCWE-787

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

The bzread function in ext/bz2/bz2.c in PHP before 5.5.38, 5.6.x before 5.6.24, and 7.x before 7.0.9 allows remote attackers to cause a denial of service (out-of-bounds write) or execute arbitrary code via a crafted bz2 archive.

Timeline

dates in UTC

2017-04-2120:59CVE 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-2016-5399?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-5399?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, < 7.0.9	7.0.9	NVD
5.6	≥ 5.6.0, < 5.6.24	5.6.24	NVD
5.5	≤ 5.5.37	no fix published	NVD

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

Fix

Update PHP to 7.0.9 · 5.6.24

Advisories and patches

php.netRelease Notes · Vendor Advisory
php.netRelease Notes · Vendor Advisory
bugs.php.netVendor Advisory

Detection

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

Sources

NVDCVSS 3.17.8read 2026-10-23
NVDCVSS 2.06.8read 2026-10-23
NVDweakness (CWE)CWE-787read 2026-10-23
FIRST EPSSEPSS score9.8 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published: 2017-04-21
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2016-5399?

Is CVE-2016-5399 actively exploited?

Active exploitation of CVE-2016-5399 has not been confirmed. Its EPSS score was 9.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2016-5399?

CVE-2016-5399 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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