ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2004-1653

OpenSSH 'AllowTcpForwarding' Port Bounce Vulnerability

Published Oct 12, 2016 · catalog updated Oct 12, 2016 · OpenBSD

Patch now

CVE-2004-1653 is in the CISA known-exploited catalog. Confirm OpenBSD against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
11.27%
Remediation
Remediation guidance
Affected products
vendor OpenBSD openssh

The default configuration for OpenSSH enables AllowTcpForwarding, which could allow remote authenticated users to perform a port bounce, when configured with an anonymous access program such as AnonCVS.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor OpenBSD opensshversion unspecified

How to fix CVE-2004-1653

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2004-1653 is in the CISA known-exploited catalog. Confirm OpenBSD against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 11.27%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 12, 2016 · VulnCheck KEV

    Detected

    The default configuration for OpenSSH enables AllowTcpForwarding, which could allow remote authenticated users to perform a port bounce, when configured with an anonymous access program such as AnonCVS.

  2. Oct 12, 2016 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Sources

  • CVE.orgVulnerability recordCVE-2004-1653

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2004-1653

    30-day exploitation probability 11.3%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-2004-1653

    The default configuration for OpenSSH enables AllowTcpForwarding, which could allow remote authenticated users to perform a port bounce, when configured with an anonymous access program such as AnonCVS.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.