No exploitation reported

CVE-2015-1555

No exploitation reported by the sources we read.

Published2017-08-07
WeaknessCWE-20

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

Zend/Session/SessionManager in Zend Framework 2.2.x before 2.2.9, 2.3.x before 2.3.4 allows remote attackers to create valid sessions without using session validators.

Timeline

dates in UTC

2017-08-0717:29CVE 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-2015-1555?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2015-1555?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Zend zend framework

Branch	Affected	Fixed in	Source
2.2	= 2.2.0	no fix published	NVD
2.2	= 2.2.1	no fix published	NVD
2.2	= 2.2.2	no fix published	NVD
2.2	= 2.2.3	no fix published	NVD
2.2	= 2.2.4	no fix published	NVD
2.2	= 2.2.5	no fix published	NVD
2.2	= 2.2.6	no fix published	NVD
2.2	= 2.2.7	no fix published	NVD
2.2	= 2.2.8	no fix published	NVD
2.3	= 2.3.0	no fix published	NVD
2.3	= 2.3.1	no fix published	NVD
2.3	= 2.3.2	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

framework.zend.comVendor Advisory

Detection

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

Sources

NVDCVSS 3.09.1read 2026-10-23
NVDCVSS 2.06.4read 2026-10-23
NVDweakness (CWE)CWE-20read 2026-10-23
FIRST EPSSEPSS score1.4 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published: 2017-08-07
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2015-1555?

Zend/Session/SessionManager in Zend Framework 2.2.x before 2.2.9, 2.3.x before 2.3.4 allows remote attackers to create valid sessions without using session validators.

Is CVE-2015-1555 actively exploited?

Active exploitation of CVE-2015-1555 has not been confirmed. Its EPSS score was 1.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2015-1555?

CVE-2015-1555 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

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