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…

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.

Scores

EPSS (exploitation in 30 days)

58.2% · top 0.9% of all CVEs (5 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.

Weakness

• n/a
• CWE-254 (opens in a new tab)All about CWE-254 and its CVEs

Affected products

• n/a

  • affected n/a

References (31)

• SSRT102180 (opens in a new tab)vendor-advisoryx_refsource_HPx_transferred
• https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04822825 (opens in a new tab)x_refsource_CONFIRMx_transferred
• 1032817 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
• http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html (opens in a new tab)x_refsource_CONFIRMx_transferred
• GLSA-201507-15 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
• http://www1.huawei.com/en/security/psirt/security-bulletins/security-advisories/hw-454058.htm (opens in a new tab)x_refsource_CONFIRMx_transferred
• http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html (opens in a new tab)x_refsource_CONFIRMx_transferred
• http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html (opens in a new tab)x_refsource_CONFIRMx_transferred
• 20150710 OpenSSL Alternative Chains Certificate Forgery Vulnerability (July 2015) Affecting Cisco Products (opens in a new tab)vendor-advisoryx_refsource_CISCOx_transferred
• https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=9a0db453ba017ebcaccbee933ee6511a9ae4d1c8 (opens in a new tab)x_refsource_CONFIRMx_transferred
• FreeBSD-SA-15:12 (opens in a new tab)vendor-advisoryx_refsource_FREEBSDx_transferred
• https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05184351 (opens in a new tab)x_refsource_CONFIRMx_transferred
• FEDORA-2015-11414 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• http://www.oracle.com/technetwork/topics/security/bulletinjul2015-2511963.html (opens in a new tab)x_refsource_CONFIRMx_transferred
• http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html (opens in a new tab)x_refsource_CONFIRMx_transferred
• http://openssl.org/news/secadv_20150709.txt (opens in a new tab)x_refsource_CONFIRMx_transferred
• http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://help.ecostruxureit.com/display/public/UADCO8x/StruxureWare+Data+Center+Operation+Software+Vulnerability+Fixes (opens in a new tab)x_refsource_CONFIRMx_transferred
• HPSBGN03424 (opens in a new tab)vendor-advisoryx_refsource_HPx_transferred
• FEDORA-2015-11475 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• http://fortiguard.com/advisory/2015-07-09-cve-2015-1793-openssl-alternative-chains-certificate-forgery (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://kc.mcafee.com/corporate/index?page=content&id=SB10125 (opens in a new tab)x_refsource_CONFIRMx_transferred
• http://www.fortiguard.com/advisory/2015-07-09-cve-2015-1793-openssl-alternative-chains-certificate-forgery (opens in a new tab)x_refsource_CONFIRMx_transferred
• http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html (opens in a new tab)x_refsource_CONFIRMx_transferred
• 91787 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
• https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05045763 (opens in a new tab)x_refsource_CONFIRMx_transferred
• 75652 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
• http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10694 (opens in a new tab)x_refsource_CONFIRMx_transferred
• 38640 (opens in a new tab)exploitx_refsource_EXPLOIT-DBx_transferred
• SSA:2015-190-01 (opens in a new tab)vendor-advisoryx_refsource_SLACKWAREx_transferred
• NetBSD-SA2015-008 (opens in a new tab)vendor-advisoryx_refsource_NETBSDx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2015-1793](https://trackcve.app/badge/CVE-2015-1793.svg)](https://trackcve.app/cve/CVE-2015-1793)

Record last updated 6 Aug 2024, 04:54 UTC.