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Vulnerability record · CVE-2018-15599 · published 21 August 2018

CVE-2018-15599: Debian linux information exposure vulnerability

Debian · Debian Linux

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.

5.3 CVSS 3.0 Medium EPSS 2.7% · top 14.7% CWE-200 · Information exposure
5.3CVSS 3.0 base score, v2 5.0
2.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2018-15599), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.