CVE-2018-15599: debian debian_linux
Vulnerability summary
CVE-2018-15599 is a medium (CVSS 5.3) vulnerability in debian debian_linux. EPSS estimates a 2.69% chance of exploitation in the next 30 days, higher than 85.8% of scored vulnerabilities.
Not severe (CVSS 5.3, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 21-08-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
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 metrics
5 scores · 4 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated5.3MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- OSV · UbuntuEcosystem advisory · calculated5.3MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- OSV · DebianEcosystem advisory · calculated5.3MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS trend
Probability
2.69%
Chance of exploitation in the next 30 days
Percentile
86%
Versus all other CVEs
30-day change
No change 0.00 pp
From 2.69% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Debian2 products
- dropbear< 2014.65-1+deb8u3 | < 2018.76-4
- debian_linuxEOL8.0
Alpine1 product
- dropbear< 2018.76-r2 | < 2017.75-r1
Dropbear_ssh_project1 product
- dropbear_ssh≤ 2018.76
Mageia1 product
- dropbear< 2017.75-1.1.mga6
Ubuntu1 product
- dropbearAll versions (No fix recorded)
5 vendors · 6 products
References
11 links- matt.ucc.asn.au/dropbear/CHANGESX Refsource CONFIRM
- lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002109.htmlX Refsource MISCMailing ListThird Party AdvisoryREPORT
- lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002108.htmlX Refsource MISCMailing ListThird Party AdvisoryWEBREPORT
lists.debian.org/debian-lts-announce/2018/08/msg00026.htmlMailing ListX Refsource MLISTThird Party Advisory- old.reddit.com/r/blackhat/comments/97ywnm/openssh_username_enumeration/e4e05n2/X Refsource MISCThird Party AdvisoryREPORT