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Vulnerabilities

Vulnerability · CVE-2021-22873

revive-adserver revive_adserver URL Redirection to Untrusted Site ('Open Redirect')

Published Nov 20, 2024 · catalog updated Nov 20, 2024 · revive-adserver revive_adserver URL Redirection

Patch now

CVE-2021-22873 is in the CISA known-exploited catalog. Confirm revive-adserver revive_adserver URL Redirection against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (revive-adserver revive_adserver URL Redirection).
  • 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
69.56%
Remediation
Remediation guidance
Affected products
vendor revive-adserver revive_adserver

Revive Adserver before 5.1.0 is vulnerable to open redirects via the , , and/or parameters of the lg.php and ck.php delivery scripts. Such open redirects had previously been available by design to allow third party ad servers to track such metrics when delivering ads. However, third party click tracking via redirects is not a viable option anymore, leading to such open redirect functionality being removed and reclassified as a vulnerability.

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 revive-adserver revive_adserverversion unspecified

How to fix CVE-2021-22873

What to do

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

Should you patch?

CVE-2021-22873 is in the CISA known-exploited catalog. Confirm revive-adserver revive_adserver URL Redirection 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 69.56%. 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. Nov 20, 2024 · VulnCheck KEV

    Detected

    Revive Adserver before 5.1.0 is vulnerable to open redirects via the , , and/or parameters of the lg.php and ck.php delivery scripts. Such open redirects had previously been available by design to allow third party ad servers to track such metrics when delivering ads. However, third party click tracking via redirects is not a viable option anymore, leading to such open redirect functionality being

  2. Nov 20, 2024 · 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-2021-22873

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-22873

    30-day exploitation probability 69.6%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-2021-22873

    Revive Adserver before 5.1.0 is vulnerable to open redirects via the , , and/or parameters of the lg.php and ck.php delivery scripts. Such open redirects had previously been available by design to allow third party ad servers to track such metrics when delivering ads. However, th

    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.