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    CVE-2014-2653

    The verify_host_key function in sshconnect.c in the client in OpenSSH 6.6 and earlier allows remote servers to trigger the skipping of SSHFP DNS RR checking by presenting an unacceptable HostCertificate.

    Published:Mar 24, 2014
    Last Modified:May 28, 2026
    EPS:Mar 27, 2014
    EPSS Score:0.0289
    CVSS Score:6.5

    Affected Products

    Vendor
    Openbsd
    Product
    Openssh
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=742513https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=742513

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-101 Server Side Include (SSI) Injection
    CAPEC-104 Cross Zone Scripting
    CAPEC-108 Command Line Execution through SQL Injection
    CAPEC-109 Object Relational Mapping Injection
    CAPEC-110 SQL Injection through SOAP Parameter Tampering
    CAPEC-114 Authentication Abuse
    CAPEC-115 Authentication Bypass
    CAPEC-120 Double Encoding
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-135 Format String Injection
    CAPEC-136 LDAP Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-151 Identity Spoofing
    CAPEC-153 Input Data Manipulation
    CAPEC-182 Flash Injection
    CAPEC-194 Fake the Source of Data
    CAPEC-209 XSS Using MIME Type Mismatch
    CAPEC-22 Exploiting Trust in Client
    CAPEC-23 File Content Injection
    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-250 XML Injection
    CAPEC-261 Fuzzing for garnering other adjacent user/sensitive data
    CAPEC-267 Leverage Alternate Encoding
    CAPEC-28 Fuzzing
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-473 Signature Spoof
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-57 Utilizing REST's Trust in the System Resource to Obtain Sensitive Data
    CAPEC-588 DOM-Based XSS
    CAPEC-593 Session Hijacking
    CAPEC-63 Cross-Site Scripting (XSS)
    CAPEC-633 Token Impersonation
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-650 Upload a Web Shell to a Web Server
    CAPEC-664 Server Side Request Forgery
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-7 Blind SQL Injection
    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic
    CAPEC-72 URL Encoding
    CAPEC-73 User-Controlled Filename
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic
    CAPEC-81 Web Server Logs Tampering
    CAPEC-83 XPath Injection
    CAPEC-85 AJAX Footprinting
    CAPEC-88 OS Command Injection
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities
    CAPEC-94 Adversary in the Middle (AiTM)

    Related CVEs

    CVE-2026-73283 (CVSS 2.5) — In sshd in OpenSSH before 10.5, the restrict keyword (in authorized_keys) was supposed to be applicable to tun…
    CVE-2026-73282 (CVSS 4.8) — In ssh in OpenSSH before 10.5, a use-after-free for realloc data can occur if a certain pair of remote-forward…
    CVE-2026-73281 (CVSS 3.5) — In ssh-agent in OpenSSH before 10.5, some operations can occur remotely but were intended to occur only locall…
    CVE-2026-60002 (CVSS 7.7) — ssh in OpenSSH before 10.4 can have a use-after-free when a server changes its host key during a key re-exchan…
    CVE-2026-60001 (CVSS 6.5) — sshd in OpenSSH before 10.4 does not always honor the minimum authentication delay.…
    CVE-2026-60000 (CVSS 3.7) — sshd in OpenSSH before 10.4 allows remote attackers to cause a denial of service (resource consumption from ex…
    CVE-2026-59999 (CVSS 5.9) — In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, b…
    CVE-2026-59998 (CVSS 4.8) — sshd in OpenSSH before 10.4 has an undocumented security-relevant behavior: GSSAPIStrictAcceptorCheck has no v…
    CVE-2026-59997 (CVSS 4.2) — internal-sftp in sshd in OpenSSH before 10.4 recognizes only the first 9 command-line arguments, which can be …
    CVE-2026-59996 (CVSS 4.2) — scp in OpenSSH before 10.4 may place a file in the parent directory of an intended directory when the copy occ…

    References

    http://advisories.mageia.org/MGASA-2014-0166.html
    http://aix.software.ibm.com/aix/efixes/security/openssh_advisory4.asc
    http://lists.fedoraproject.org/pipermail/package-announce/2014-June/134026.html
    http://lists.fedoraproject.org/pipermail/package-announce/2014-May/133537.html
    http://marc.info/?l=bugtraq&m=141576985122836&w=2
    http://openwall.com/lists/oss-security/2014/03/26/7
    http://rhn.redhat.com/errata/RHSA-2014-1552.html
    http://rhn.redhat.com/errata/RHSA-2015-0425.html
    http://secunia.com/advisories/59855
    http://www.debian.org/security/2014/dsa-2894
    http://www.mandriva.com/security/advisories?name=MDVSA-2014:068
    http://www.mandriva.com/security/advisories?name=MDVSA-2015:095
    http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
    http://www.securityfocus.com/bid/66459
    http://www.ubuntu.com/usn/USN-2164-1
    https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=742513
    http://advisories.mageia.org/MGASA-2014-0166.html
    http://aix.software.ibm.com/aix/efixes/security/openssh_advisory4.asc
    http://lists.fedoraproject.org/pipermail/package-announce/2014-June/134026.html
    http://lists.fedoraproject.org/pipermail/package-announce/2014-May/133537.html
    http://marc.info/?l=bugtraq&m=141576985122836&w=2
    http://openwall.com/lists/oss-security/2014/03/26/7
    http://rhn.redhat.com/errata/RHSA-2014-1552.html
    http://rhn.redhat.com/errata/RHSA-2015-0425.html
    http://secunia.com/advisories/59855
    http://www.debian.org/security/2014/dsa-2894
    http://www.mandriva.com/security/advisories?name=MDVSA-2014:068
    http://www.mandriva.com/security/advisories?name=MDVSA-2015:095
    http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
    http://www.securityfocus.com/bid/66459
    http://www.ubuntu.com/usn/USN-2164-1
    https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=742513

    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