No exploitation reportedFix available

CVE-2015-1793

No exploitation reported by the sources we read.

Published2015-07-09
WeaknessCWE-254

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 X509_verify_cert function in crypto/x509/x509_vfy.c in OpenSSL 1.0.1n, 1.0.1o, 1.0.2b, and 1.0.2c does not properly process X.509 Basic Constraints cA values during identification of alternative certificate chains, which allows remote attackers to spoof a Certification Authority role and trigger unintended certificate verifications via a valid leaf certificate.

Timeline

dates in UTC

2015-07-0919:17CVE publishedNVD
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

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-2015-1793?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2015-1793?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

OpenSSL

Branch	Affected	Fixed in	Source
1.0	= 1.0.1n	no fix published	NVD
1.0	= 1.0.1o	no fix published	NVD
1.0	= 1.0.2b	no fix published	NVD
1.0	= 1.0.2c	no fix published	NVD

Oracle supply chain products suite

Branch	Affected	Fixed in	Source
6.1	= 6.1.2.2	no fix published	NVD
6.1	= 6.1.3.0	no fix published	NVD
6.2	= 6.2.0	no fix published	NVD

Oracle jd edwards enterpriseone tools

Branch	Affected	Fixed in	Source
9.1	= 9.1	no fix published	NVD
9.2	= 9.2	no fix published	NVD

1 more product in the sources.

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

Fix

Advisories and patches

Detection

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

Sources

NVDCVSS 3.06.5read 2026-10-23
NVDCVSS 2.06.4read 2026-10-23
NVDweakness (CWE)CWE-254read 2026-10-23
FIRST EPSSEPSS score58.2 %read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Published: 2015-07-09
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2015-1793?

Is CVE-2015-1793 actively exploited?

Active exploitation of CVE-2015-1793 has not been confirmed. Its EPSS score was 58.2% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2015-1793?

CVE-2015-1793 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

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