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Fencer Vulns
high 7.5

CVE-2003-0386 json

OpenSSH 3.6.1 and earlier, when restricting host access by numeric IP addresses and with VerifyReverseMapping disabled, allows remote attac…

published 2003-06-10 23 y ago modified 2026-06-16 4 mo ago also EUVD-2003-0380

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.8%
EPSS 5.8% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

OpenSSH 3.6.1 and earlier, when restricting host access by numeric IP addresses and with VerifyReverseMapping disabled, allows remote attackers to bypass "from=" and "user@host" address restrictions by connecting to a host from a system whose reverse DNS hostname contains the numeric IP address.

Patch / fix

  • openssh Debian 14, Debian 13, Debian 12 1:3.8p1-1

debian advisories DEBIAN-CVE-2003-0386

  • openssh RHEL 2.1 3.1p1-21
  • openssh-server RHEL 2.1 3.1p1-21
  • openssh-askpass RHEL 2.1 3.1p1-21
  • openssh-clients RHEL 2.1 3.1p1-21
  • openssh-askpass-gnome RHEL 2.1 3.1p1-21
  • openssh RHEL 3 3.6.1p2-33.30.9
  • openssh-server RHEL 3 3.6.1p2-33.30.9
  • openssh-askpass RHEL 3 3.6.1p2-33.30.9

red hat advisories RHSA-2006:0698RHSA-2006:0298

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2003-0386 updated

security flaw

  • Red Hat Desktop version 3 openssh 3.6.1p2-33.30.9, openssh-server 3.6.1p2-33.30.9, openssh-askpass 3.6.1p2-33.30.9, openssh-clients 3.6.1p2-33.30.9, openssh-askpass-gnome 3.6.1p2-33.30.9
    fixed: vendor fix RHSA-2006:0298
  • Red Hat Enterprise Linux AS (Advanced Server) version 2.1 openssh 3.1p1-21, openssh-server 3.1p1-21, openssh-askpass 3.1p1-21, openssh-clients 3.1p1-21, openssh-askpass-gnome 3.1p1-21
    fixed: vendor fix RHSA-2006:0698
  • Red Hat Enterprise Linux AS version 3 openssh 3.6.1p2-33.30.9, openssh-server 3.6.1p2-33.30.9, openssh-askpass 3.6.1p2-33.30.9, openssh-clients 3.6.1p2-33.30.9, openssh-askpass-gnome 3.6.1p2-33.30.9
    fixed: vendor fix RHSA-2006:0298
  • Red Hat Enterprise Linux ES version 2.1 openssh 3.1p1-21, openssh-server 3.1p1-21, openssh-askpass 3.1p1-21, openssh-clients 3.1p1-21, openssh-askpass-gnome 3.1p1-21
    fixed: vendor fix RHSA-2006:0698
  • Red Hat Enterprise Linux ES version 3 openssh 3.6.1p2-33.30.9, openssh-server 3.6.1p2-33.30.9, openssh-askpass 3.6.1p2-33.30.9, openssh-clients 3.6.1p2-33.30.9, openssh-askpass-gnome 3.6.1p2-33.30.9
    fixed: vendor fix RHSA-2006:0298
  • Red Hat Enterprise Linux WS version 2.1 openssh 3.1p1-21, openssh-server 3.1p1-21, openssh-askpass 3.1p1-21, openssh-clients 3.1p1-21, openssh-askpass-gnome 3.1p1-21
    fixed: vendor fix RHSA-2006:0698
  • Red Hat Enterprise Linux WS version 3 openssh 3.6.1p2-33.30.9, openssh-server 3.6.1p2-33.30.9, openssh-askpass 3.6.1p2-33.30.9, openssh-clients 3.6.1p2-33.30.9, openssh-askpass-gnome 3.6.1p2-33.30.9
    fixed: vendor fix RHSA-2006:0298
  • Red Hat Linux Advanced Workstation 2.1 openssh 3.1p1-21, openssh-server 3.1p1-21, openssh-askpass 3.1p1-21, openssh-clients 3.1p1-21, openssh-askpass-gnome 3.1p1-21
    fixed: vendor fix RHSA-2006:0698

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

5.77% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • kb.cert.org http://www.kb.cert.org/vuls/id/978316 referenced PoC, tagged "exploit" by a source, unverified
  • securityfocus.com http://www.securityfocus.com/archive/1/324016/2003-06-03/2003-06-09/0 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.