CVE-2015-1793
MEDIUMEPSS 99th pctlDescription
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.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Exploit Intelligence
Very high risk: more likely to be exploited than 99% of all known CVEs.
References
- fortiguard.com
- ftp.netbsd.org
- kb.juniper.net
- lists.fedoraproject.org
- lists.fedoraproject.org
- marc.info
- marc.info
- tools.cisco.com
- fortiguard.com
- oracle.com
- oracle.com
- oracle.com
- oracle.com
- securityfocus.com
- securityfocus.com
- securitytracker.com
- slackware.com
- www1.huawei.com
- git.openssl.org
- h20564.www2.hpe.com
- h20566.www2.hpe.com
- h20566.www2.hpe.com
- help.ecostruxureit.com
- kc.mcafee.com
- security.gentoo.org
- exploit-db.com
- freebsd.org
Related Vulnerabilities
Other CWE-254 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2016-0161 | Medium | 6.5 | 69% | - | - |
| CVE-2016-2296 | Critical | 9.4 | 64% | - | - |
| CVE-2016-2118 | High | 7.5 | 37% | - | Fix |
| CVE-2016-3238 | High | 8.1 | 35% | - | - |
| CVE-2016-3198 | Medium | 6.5 | 32% | - | - |
| CVE-2015-1158 | High | 10.0 | 30% | - | Fix |
Common questions
How do I fix CVE-2015-1793?
Upgrade openssl on debian 11 to 1.0.2d-1 or later.
Is CVE-2015-1793 being actively exploited?
Not that we know of. CVE-2015-1793 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 61.8% is the estimated probability that it will be exploited in the next 30 days. That is higher than 99% of all scored CVEs.
How severe is CVE-2015-1793?
CVE-2015-1793 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2015-1793 affect?
Published advisories record a fix for openssl (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.