No exploitation reportedFix available

CVE-2015-7503

Q: Is CVE-2015-7503 actively exploited?

Active exploitation of CVE-2015-7503 has not been confirmed. Its EPSS score was 1.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2015-7503?

CVE-2015-7503 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:H/I:N/A:N.

No exploitation reported by the sources we read.

Published2017-10-10
WeaknessCWE-320

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 Framework before 2.4.9, zend-framework/zend-crypt 2.4.x before 2.4.9, and 2.5.x before 2.5.2 allows remote attackers to recover the RSA private key.

Timeline

dates in UTC

2017-10-1016:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 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-2015-7503?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2015-7503?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Zend zend framework

Branch	Affected	Fixed in	Source
2.4	= 2.4.0	no fix published	NVD
2.4	= 2.4.1	no fix published	NVD
2.4	= 2.4.2	no fix published	NVD
2.4	= 2.4.3	no fix published	NVD
2.4	= 2.4.4	no fix published	NVD
2.4	= 2.4.5	no fix published	NVD
2.4	= 2.4.6	no fix published	NVD
2.4	= 2.4.7	no fix published	NVD
2.4	= 2.4.8	no fix published	NVD
2.5	= 2.5.0	no fix published	NVD
2.5	= 2.5.1	no fix published	NVD

zendframework/zend-crypt

Branch	Affected	Fixed in	Source
2.5	≥ 2.5.0, < 2.5.2	2.5.2	OSV
2.x	≥ 2.0.0, < 2.4.9	2.4.9	OSV

zendframework/zendframework

Branch	Affected	Fixed in	Source
2.5	≥ 2.5.0, < 2.5.2	2.5.2	OSV
2.x	≥ 2.0.0, < 2.4.9	2.4.9	OSV

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 3.07.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-320read 2026-10-23
FIRST EPSSEPSS score1.4 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published: 2017-10-10
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2015-7503?

Zend Framework before 2.4.9, zend-framework/zend-crypt 2.4.x before 2.4.9, and 2.5.x before 2.5.2 allows remote attackers to recover the RSA private key.

Is CVE-2015-7503 actively exploited?

Active exploitation of CVE-2015-7503 has not been confirmed. Its EPSS score was 1.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2015-7503?

CVE-2015-7503 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:H/I:N/A:N.

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