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Fencer Intel
medium 6.5

CVE-2015-1793 json

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…

published 11y ago modified 4mo ago also EUVD-2015-1919

cvss
6.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
58.2%
EPSS 58.2% chance of exploitation in 30 days, percentile 99%
public exploits
2
Metasploit and Exploit-DB

Summary

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.

Patch / fix

  • openssl Debian 14, Debian 13, Debian 12 1.0.2d-1

debian advisories DEBIAN-CVE-2015-1793

  • mysql SLES for SAP 11 SP4, SLES for SAP 11 SP3, SLES 11 SP4 +6 more 5.5.46-0.14.1

suse advisories SUSE-SU-2015:2303-1

  • openssl-1_1 openSUSE Tumbleweed 1.1.1l-1.2

opensuse advisories openSUSE-SU-2024:11127-1

Is CVE-2015-1793 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2015-1793 updated cvss 5.8

openssl: alternative chains certificate forgery

  • Red Hat Enterprise Linux 4 openssl Red Hat Enterprise Linux 5 openssl, openssl097a Red Hat Enterprise Linux 6 openssl, openssl098e, openssl-perl Red Hat Enterprise Linux 7 openssl, openssl098e, openssl-libs, openssl-perl Red Hat JBoss Enterprise Application Platform 6 openssl Red Hat JBoss Enterprise Web Server 1 openssl
    +1 more products
    Red Hat JBoss Enterprise Web Server 2 openssl
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (Metasploit auxiliary/server/openssl_altchainsforgery_mitm_proxy)
  2. Published

Exploit prediction

58.21% chance of exploitation in the next 30 days, higher than 99% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

CVSS scores

assigned by version score vector
NVD 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:P/A:N

Classification

Weakness
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.