All vulnerabilities

Servers and applications

CVE-2003-0386

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.

Severity
High 7.5
Published
2 Jul 2003
Last changed
16 Jun 2026
Added to UpHeron
21 Oct 2026
Exploit chance
5.8% in the next 30 daysHigher than 93% of CVEs. EPSS by FIRST, 12 Nov 2026
Attack
Over the network · No login needed
Attacker can
Read some data · Change some data · Slow it down
CVSS vector
AV:N/AC:L/Au:N/C:P/I:P/A:P
Sources
NVD

Affected software

SoftwareAffected versions
OpenSSHServers and applications · cpe:a:openbsd:openssh
  • Version 3.6.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2003-0386
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2003-0386