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    CVE-2015-1793

    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.

    Published:Jul 9, 2015
    Last Modified:Apr 12, 2025
    EPS:Jul 9, 2015
    EPSS Score:0.82685
    CVSS Score:6.5

    Affected Products

    Vendor
    Openssl
    Product
    Openssl
    Vendor
    Oracle
    Product
    Jd Edwards Enterpriseone Tools
    Vendor
    Oracle
    Product
    Opus 10g Ethernet Switch Family
    Vendor
    Oracle
    Product
    Supply Chain Products Suite

    Exploits

    https://www.exploit-db.com/exploits/38640

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-75803 (CVSS 9.1) — Issue summary: ChaCha20-Poly1305 and AES-OCB decryption with an empty ciphertext can report success without ve…
    CVE-2026-63075 (CVSS 7.5) — Issue summary: When OpenSSL processes QUIC traffic from a peer that repeatedly sends ack-eliciting packets whi…
    CVE-2026-63072 (CVSS 7.5) — Issue summary: OpenSSL CMS decryption sizes the key-unwrap output buffer based on querying the unwrapped key s…
    CVE-2026-54874 (CVSS 7.5) — Issue summary: Receiving a DTLS record for a future epoch while a handshake is in progress causes OpenSSL to b…
    CVE-2026-14457 (CVSS 7.5) — Issue summary: In a server or client configuration with RFC7250 Raw Public Keys (RPKs) enabled, and only the p…
    CVE-2026-63076 (CVSS 7.5) — Issue summary: OpenSSL CMP password based protection verification only checks whether the protectionAlg parame…
    CVE-2026-63074 (CVSS 5.9) — Issue summary: The OpenSSL Certificate Management Protocol (CMP) caches additional certificates (extraCerts) s…
    CVE-2026-63073 (CVSS 9.8) — Issue summary: OpenSSL CMP response validation passed an unexpected response sender distinguished name directl…
    CVE-2026-18798 (CVSS 7.5) — Issue summary: QUIC server may double free QRX (QUIC record layer RX) object when channel creation fails for i…
    CVE-2026-14456 (CVSS 7.5) — Issue summary: When an OpenSSL QUIC server (Listener SSL object) processes valid QUIC Initial packets for unkn…

    References

    http://fortiguard.com/advisory/2015-07-09-cve-2015-1793-openssl-alternative-chains-certificate-forgery
    http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2015-008.txt.asc
    http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10694
    http://lists.fedoraproject.org/pipermail/package-announce/2015-July/161747.html
    http://lists.fedoraproject.org/pipermail/package-announce/2015-July/161782.html
    http://marc.info/?l=bugtraq&m=143880121627664&w=2
    http://marc.info/?l=bugtraq&m=144370846326989&w=2
    http://openssl.org/news/secadv_20150709.txt
    http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150710-openssl
    http://www.fortiguard.com/advisory/2015-07-09-cve-2015-1793-openssl-alternative-chains-certificate-forgery
    http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
    http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
    http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
    http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
    http://www.oracle.com/technetwork/topics/security/bulletinjul2015-2511963.html
    http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
    http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html
    http://www.securityfocus.com/bid/75652
    http://www.securityfocus.com/bid/91787
    http://www.securitytracker.com/id/1032817
    http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.561427
    http://www1.huawei.com/en/security/psirt/security-bulletins/security-advisories/hw-454058.htm
    https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=9a0db453ba017ebcaccbee933ee6511a9ae4d1c8
    https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04822825
    https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05045763
    https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05184351
    https://help.ecostruxureit.com/display/public/UADCO8x/StruxureWare+Data+Center+Operation+Software+Vulnerability+Fixes
    https://kc.mcafee.com/corporate/index?page=content&id=SB10125
    https://security.gentoo.org/glsa/201507-15
    https://www.exploit-db.com/exploits/38640/
    https://www.freebsd.org/security/advisories/FreeBSD-SA-15:12.openssl.asc
    http://fortiguard.com/advisory/2015-07-09-cve-2015-1793-openssl-alternative-chains-certificate-forgery
    http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2015-008.txt.asc
    http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10694
    http://lists.fedoraproject.org/pipermail/package-announce/2015-July/161747.html
    http://lists.fedoraproject.org/pipermail/package-announce/2015-July/161782.html
    http://marc.info/?l=bugtraq&m=143880121627664&w=2
    http://marc.info/?l=bugtraq&m=144370846326989&w=2
    http://openssl.org/news/secadv_20150709.txt
    http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150710-openssl
    http://www.fortiguard.com/advisory/2015-07-09-cve-2015-1793-openssl-alternative-chains-certificate-forgery
    http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
    http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
    http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
    http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
    http://www.oracle.com/technetwork/topics/security/bulletinjul2015-2511963.html
    http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
    http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html
    http://www.securityfocus.com/bid/75652
    http://www.securityfocus.com/bid/91787
    http://www.securitytracker.com/id/1032817
    http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.561427
    http://www1.huawei.com/en/security/psirt/security-bulletins/security-advisories/hw-454058.htm
    https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=9a0db453ba017ebcaccbee933ee6511a9ae4d1c8
    https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04822825
    https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05045763
    https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05184351
    https://help.ecostruxureit.com/display/public/UADCO8x/StruxureWare+Data+Center+Operation+Software+Vulnerability+Fixes
    https://kc.mcafee.com/corporate/index?page=content&id=SB10125
    https://security.gentoo.org/glsa/201507-15
    https://www.exploit-db.com/exploits/38640/
    https://www.freebsd.org/security/advisories/FreeBSD-SA-15:12.openssl.asc

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High