CVE-2018-15599 Information disclosure in n/a

What is CVE-2018-15599?

CVE-2018-15599 is a medium-severity vulnerability in Debian Debian Linux, published on 21 Aug 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-200

Which versions are affected by CVE-2018-15599?

It affects 2 products.

Products include Debian Debian Linux, Dropbear Ssh Project Dropbear Ssh.

How do I fix CVE-2018-15599?

Upgrade to a fixed version.

Is CVE-2018-15599 being exploited?

There is no known exploitation of CVE-2018-15599 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2018-15599, DEBIAN-CVE-2018-15599, DLA-1476-1, GHSA-g4h3-rm2q-r287, MGASA-2018-0384, UBUNTU-CVE-2018-15599.