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    CVE-2018-15473

    OpenSSH through 7.7 is prone to a user enumeration vulnerability due to not delaying bailout for an invalid authenticating user until after the packet containing the request has been fully parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c.

    Published:Aug 16, 2018
    Last Modified:Dec 17, 2025
    EPS:Aug 17, 2018
    EPSS Score:0.89879
    CVSS Score:5.9

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Netapp
    Product
    Aff Baseboard Management Controller
    Vendor
    Netapp
    Product
    Cloud Backup
    Vendor
    Netapp
    Product
    Clustered Data Ontap
    Vendor
    Netapp
    Product
    Cn1610
    Vendor
    Netapp
    Product
    Cn1610 Firmware
    Vendor
    Netapp
    Product
    Data Ontap
    Vendor
    Netapp
    Product
    Data Ontap Edge
    Vendor
    Netapp
    Product
    Fas Baseboard Management Controller
    Vendor
    Netapp
    Product
    Oncommand Unified Manager
    Vendor
    Netapp
    Product
    Ontap Select Deploy
    Vendor
    Netapp
    Product
    Service Processor
    Vendor
    Netapp
    Product
    Steelstore Cloud Integrated Storage
    Vendor
    Netapp
    Product
    Storage Replication Adapter
    Vendor
    Netapp
    Product
    Vasa Provider
    Vendor
    Netapp
    Product
    Virtual Storage Console
    Vendor
    Openbsd
    Product
    Openssh
    Vendor
    Oracle
    Product
    Sun Zfs Storage Appliance Kit
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux Desktop
    Vendor
    Redhat
    Product
    Enterprise Linux Server
    Vendor
    Redhat
    Product
    Enterprise Linux Workstation
    Vendor
    Siemens
    Product
    Scalance X204rna
    Vendor
    Siemens
    Product
    Scalance X204rna Firmware

    Exploits

    https://www.exploit-db.com/exploits/45210/https://www.exploit-db.com/exploits/45233/https://www.exploit-db.com/exploits/45939/https://www.exploit-db.com/exploits/45210/https://www.exploit-db.com/exploits/45233/https://www.exploit-db.com/exploits/45939/https://www.exploit-db.com/exploits/45233https://github.com/0xNehru/ssh_Enum_vaildhttps://github.com/0xrobiul/CVE-2018-15473https://github.com/1stPeak/CVE-2018-15473https://github.com/4xolotl/CVE-2018-15473https://github.com/66quentin/shodan-CVE-2018-15473https://github.com/Alph4Sec/ssh_enum_pyhttps://github.com/An0nYm0u5101/enumpossiblehttps://github.com/Anonimo501/ssh_enum_users_CVE-2018-15473https://github.com/anonymous121029034720384234234/py-network-scannerhttps://github.com/bdalrhmnhamdalalm-jpg/CVE-2018-15473-User-Enumeration-https://github.com/CaioCGH/EP4-redeshttps://github.com/coollce/CVE-2018-15473_burtehttps://github.com/cved-sources/cve-2018-15473https://github.com/Dirty-Racoon/CVE-2018-15473-py3https://github.com/epi052/cve-2018-15473https://github.com/GaboLC98/userenum-CVE-2018-15473https://github.com/gbonacini/opensshenumhttps://github.com/JoeBlackSecurity/SSHUsernameBruter-SSHUBhttps://github.com/jubeenshah/CVE-2018-15473-Exploithttps://github.com/K3rn3l-32/Threaded-CVE-2018-15473https://github.com/kaktus5454/CVE-2018-15473https://github.com/kikechans/-SSH-Enum-CVE-2018-15473https://github.com/LINYIKAI/CVE-2018-15473-exphttps://github.com/MahdiOsman/CVE-2018-15473-SNMPv1-2-Community-String-Vulnerability-Testinghttps://github.com/makmour/open-ssh-user-enumerationhttps://github.com/mclbn/docker-cve-2018-15473https://github.com/moften/cve-2018-15473-pochttps://github.com/Moon1705/easy_securityhttps://github.com/MrDottt/CVE-2018-15473https://github.com/NestyF/SSH_Enum_CVE-2018-15473https://github.com/NHPT/SSH-account-enumeration-verification-scripthttps://github.com/OmarV4066/SSHEnumKLhttps://github.com/philippedixon/CVE-2018-15473https://github.com/pyperanger/CVE-2018-15473_exploithttps://github.com/r3dxpl0it/CVE-2018-15473https://github.com/Remnant-DB/CVE-2018-15473https://github.com/Rhynorater/CVE-2018-15473-Exploithttps://github.com/Sait-Nuri/CVE-2018-15473https://github.com/sergiovks/SSH-User-Enum-Python3-CVE-2018-15473https://github.com/SUDORM0X/PoC-CVE-2018-15473https://github.com/trickster1103/-https://github.com/trimstray/massh-enumhttps://github.com/Wh1t3Fox/cve-2018-15473https://github.com/WildfootW/CVE-2018-15473_OpenSSH_7.7https://github.com/wtbacon/cve-2018-15473https://github.com/yZee00/CVE-2018-15473https://www.exploit-db.com/exploits/45210https://www.exploit-db.com/exploits/45939

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-116 Excavation
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-169 Footprinting
    CAPEC-22 Exploiting Trust in Client
    CAPEC-224 Fingerprinting
    CAPEC-26 Leveraging Race Conditions
    CAPEC-285 ICMP Echo Request Ping
    CAPEC-287 TCP SYN Scan
    CAPEC-29 Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions
    CAPEC-290 Enumerate Mail Exchange (MX) Records
    CAPEC-291 DNS Zone Transfers
    CAPEC-292 Host Discovery
    CAPEC-293 Traceroute Route Enumeration
    CAPEC-294 ICMP Address Mask Request
    CAPEC-295 Timestamp Request
    CAPEC-296 ICMP Information Request
    CAPEC-297 TCP ACK Ping
    CAPEC-298 UDP Ping
    CAPEC-299 TCP SYN Ping
    CAPEC-300 Port Scanning
    CAPEC-301 TCP Connect Scan
    CAPEC-302 TCP FIN Scan
    CAPEC-303 TCP Xmas Scan
    CAPEC-304 TCP Null Scan
    CAPEC-305 TCP ACK Scan
    CAPEC-306 TCP Window Scan
    CAPEC-307 TCP RPC Scan
    CAPEC-308 UDP Scan
    CAPEC-309 Network Topology Mapping
    CAPEC-310 Scanning for Vulnerable Software
    CAPEC-312 Active OS Fingerprinting
    CAPEC-313 Passive OS Fingerprinting
    CAPEC-317 IP ID Sequencing Probe
    CAPEC-318 IP 'ID' Echoed Byte-Order Probe
    CAPEC-319 IP (DF) 'Don't Fragment Bit' Echoing Probe
    CAPEC-320 TCP Timestamp Probe
    CAPEC-321 TCP Sequence Number Probe
    CAPEC-322 TCP (ISN) Greatest Common Divisor Probe
    CAPEC-323 TCP (ISN) Counter Rate Probe
    CAPEC-324 TCP (ISN) Sequence Predictability Probe
    CAPEC-325 TCP Congestion Control Flag (ECN) Probe
    CAPEC-326 TCP Initial Window Size Probe
    CAPEC-327 TCP Options Probe
    CAPEC-328 TCP 'RST' Flag Checksum Probe
    CAPEC-329 ICMP Error Message Quoting Probe
    CAPEC-330 ICMP Error Message Echoing Integrity Probe
    CAPEC-472 Browser Fingerprinting
    CAPEC-497 File Discovery
    CAPEC-508 Shoulder Surfing
    CAPEC-573 Process Footprinting
    CAPEC-574 Services Footprinting
    CAPEC-575 Account Footprinting
    CAPEC-576 Group Permission Footprinting
    CAPEC-577 Owner Footprinting
    CAPEC-59 Session Credential Falsification through Prediction
    CAPEC-60 Reusing Session IDs (aka Session Replay)
    CAPEC-616 Establish Rogue Location
    CAPEC-643 Identify Shared Files/Directories on System
    CAPEC-646 Peripheral Footprinting
    CAPEC-651 Eavesdropping
    CAPEC-79 Using Slashes in Alternate Encoding

    Related CVEs

    CVE-2026-13476 (CVSS 7.3) — IBM Informix Dynamic Server 14.10, 15.0, and 12.10 could allow an unauthenticated user to execute arbitrary co…
    CVE-2026-13367 (CVSS 7.8) — IBM Informix Dynamic Server 14.10, and 15.0 contain a local privilege escalation vulnerability in the oninit s…
    CVE-2026-47337 (CVSS 3.3) — Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling …
    CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…
    CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…
    CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…
    CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…
    CVE-2026-47332 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern…
    CVE-2026-47331 (CVSS 7.8) — Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An…
    CVE-2026-47330 (CVSS 3.3) — Ubuntu Linux 6.8, 7.17 and 7.0 contain AppArmor SAUCE patches which can, under certain circumstances, use an u…

    References

    http://www.openwall.com/lists/oss-security/2018/08/15/5
    http://www.securityfocus.com/bid/105140
    http://www.securitytracker.com/id/1041487
    https://access.redhat.com/errata/RHSA-2019:0711
    https://access.redhat.com/errata/RHSA-2019:2143
    https://bugs.debian.org/906236
    https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
    https://github.com/openbsd/src/commit/779974d35b4859c07bc3cb8a12c74b43b0a7d1e0
    https://lists.debian.org/debian-lts-announce/2018/08/msg00022.html
    https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0011
    https://security.gentoo.org/glsa/201810-03
    https://security.netapp.com/advisory/ntap-20181101-0001/
    https://usn.ubuntu.com/3809-1/
    https://www.debian.org/security/2018/dsa-4280
    https://www.exploit-db.com/exploits/45210/
    https://www.exploit-db.com/exploits/45233/
    https://www.exploit-db.com/exploits/45939/
    https://www.oracle.com/security-alerts/cpujan2020.html
    http://www.openwall.com/lists/oss-security/2018/08/15/5
    http://www.securityfocus.com/bid/105140
    http://www.securitytracker.com/id/1041487
    https://access.redhat.com/errata/RHSA-2019:0711
    https://access.redhat.com/errata/RHSA-2019:2143
    https://bugs.debian.org/906236
    https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
    https://github.com/openbsd/src/commit/779974d35b4859c07bc3cb8a12c74b43b0a7d1e0
    https://lists.debian.org/debian-lts-announce/2018/08/msg00022.html
    https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0011
    https://security.gentoo.org/glsa/201810-03
    https://security.netapp.com/advisory/ntap-20181101-0001/
    https://usn.ubuntu.com/3809-1/
    https://www.debian.org/security/2018/dsa-4280
    https://www.exploit-db.com/exploits/45210/
    https://www.exploit-db.com/exploits/45233/
    https://www.exploit-db.com/exploits/45939/
    https://www.oracle.com/security-alerts/cpujan2020.html

    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