CVE-2018-15473
Concurrent Execution using Shared Resource with Improper Synchronization
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Description
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.
Official description from the CVE record, published by mitre. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org
Key data
CVSS 3.1 Medium 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector: Network
The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity: High
The attack depends on conditions outside the attacker's control, so it takes preparation.
Privileges required: None
No account or privileges are needed.
User interaction: None
No action from any user is needed.
Scope: Unchanged
The impact stays within the vulnerable component.
Confidentiality impact: High
Serious or total effect on the secrecy of data.
Integrity impact: None
No effect on the trustworthiness of data.
Availability impact: None
No effect on availability.
| Metric | Value | What it means |
|---|---|---|
| Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. |
| Attack complexity | High | The attack depends on conditions outside the attacker's control, so it takes preparation. |
| Privileges required | None | No account or privileges are needed. |
| User interaction | None | No action from any user is needed. |
| Scope | Unchanged | The impact stays within the vulnerable component. |
| Confidentiality impact | High | Serious or total effect on the secrecy of data. |
| Integrity impact | None | No effect on the trustworthiness of data. |
| Availability impact | None | No effect on availability. |
CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.
EPSS
- Score
- 0.98675 (98.7% probability)
- Percentile
- 99.9%
- Scores of
- Nov 10, 2026
- Model
- v2026.06.15
CISA assessment as of Dec 17, 2025
- Exploitation
- Public proof of concept recorded by CISA
- Automatable
- no
- Technical impact
- partial
Weakness (CWE)
- CWE-362Concurrent Execution using Shared Resource with Improper Synchronization
References
- GLSA-201810-03 (security.gentoo.org)vendor-advisory
- 1041487 (securitytracker.com)vdb-entry
- 45233 (exploit-db.com)exploit
- bugs.debian.org/906236
- 45210 (exploit-db.com)exploit
- security.netapp.com/advisory/ntap-20181101-0001
- github.com/openbsd/src/commit/779974d35b4859c07bc3cb8a12c74…
- USN-3809-1 (usn.ubuntu.com)vendor-advisory
- [debian-lts-announce] 20180821 [SECURITY] [DLA-1474-1] openssh security update (lists.debian.org)mailing-list
- 105140 (securityfocus.com)vdb-entry
- DSA-4280 (debian.org)vendor-advisory
- 45939 (exploit-db.com)exploit
- psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0011
- openwall.com/lists/oss-security/2018/08/15/5
- RHSA-2019:0711 (access.redhat.com)vendor-advisory
- RHSA-2019:2143 (access.redhat.com)vendor-advisory
- oracle.com/security-alerts/cpujan2020.html
- cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
Timeline
- ID reserved
- Record published
- Record last updated
Look up another CVE
About CubePath
Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:49 UTC. Sources and licenses