Vulnerability · CVE-2021-22873
revive-adserver revive_adserver URL Redirection to Untrusted Site ('Open Redirect')
Published Nov 20, 2024 · corrected/updated Nov 20, 2024 · revive-adserver revive_adserver · evidence confidence very high
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.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2021-22873 is a unknown public vulnerability record for revive-adserver revive_adserver. CISA lists it as known exploited. Published remediation guidance: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether revive-adserver revive_adserver is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: revive-adserver revive_adserver. Published remediation guidance: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: no CVSS/EPSS yet. CISA lists it as known exploited. Sources contributing to this record: cve_org, vulncheck_kev. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Confirmed in CISA KEV since Nov 20, 2024. Listed in CISA KEV and VulnCheck KEV.
Patch and remediation
Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
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.
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
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.
Affected
- vendor revive-adserver revive_adserverversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2021-22873
Official CVE identifier
cve.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