CVE-2018-15599

Name: CVE-2018-15599
Creator: NVD / NIST
Published: 2018-08-21T01:29:00.35+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.71%

Last modified Jun 17, 2026

CVE-2018-15599 is a vulnerability of currently unknown severity. The recv_msg_userauth_request function in svr-auth.c in Dropbear through 2018.76 is prone to a user enumeration vulnerability because username validity affects how fields in SSH_MSG_USERAUTH messages are handled, a similar issue to CVE-2018-15473 in an unrelated codebase.. EPSS estimates a 2.71% chance of exploitation in the next 30 days.

Description

The recv_msg_userauth_request function in svr-auth.c in Dropbear through 2018.76 is prone to a user enumeration vulnerability because username validity affects how fields in SSH_MSG_USERAUTH messages are handled, a similar issue to CVE-2018-15473 in an unrelated codebase.

Metrics

EPSS Probability

2.71%

84.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions
Debian	Debian Linux	8.0
Dropbear Ssh Project	Dropbear Ssh	<= 2018.76

References

http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002108.htmlMailing List, Third Party Advisory
http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002109.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/08/msg00026.htmlMailing List, Third Party Advisory
https://matt.ucc.asn.au/dropbear/CHANGES
https://old.reddit.com/r/blackhat/comments/97ywnm/openssh_username_enumeration/e4e05n2/Third Party Advisory
http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002108.htmlMailing List, Third Party Advisory
http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002109.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/08/msg00026.htmlMailing List, Third Party Advisory
https://matt.ucc.asn.au/dropbear/CHANGES
https://old.reddit.com/r/blackhat/comments/97ywnm/openssh_username_enumeration/e4e05n2/Third Party Advisory

Timeline

Published: Aug 21, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-15599?

How severe is CVE-2018-15599?

Severity scoring for CVE-2018-15599 is pending analysis. The EPSS model estimates a 2.71% probability of exploitation in the next 30 days.

How do I fix CVE-2018-15599?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-15599?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST