CVE-2018-15599

MediumCVSS 5.3/10Last modified Jun 17, 2026

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

CVSS 3.0 5.3/10CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Weakness enumeration

CWE-200

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

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
NVD status: Modified

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