CVE-2021-22873 json
Revive Adserver before 5.1.0 is vulnerable to open redirects via the `dest`, `oadest`, and/or `ct0` parameters of the lg.php and ck.php del…
published 2021-01-21 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-10008
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 69.6%
- EPSS 69.6% chance of exploitation in 30 days, percentile 99.3%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
Revive Adserver before 5.1.0 is vulnerable to open redirects via the `dest`, `oadest`, and/or `ct0` 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.
Patch / fix
- revive-adserver revive_adserver 5.1.0
Exploit prediction
69.56% chance of exploitation in the next 30 days, higher than 99.3% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template Revive Adserver <5.1.0 - Open Redirect nuclei detection template
- hackerone.com https://hackerone.com/reports/1081406 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 5.8 | AV:N/AC:M/Au:N/C:P/I:P/A:N |
Affected products
- n/a https://github.com/revive-adserver/revive-adserver
Classification
- Weakness
-
- CWE-601 URL Redirection to Untrusted Site
References
-
hackerone.com
/reports/1081406
exploit, third-party-advisory
-
revive-adserver.com
/security/revive-sa-2021-001/
vendor-advisory
-
github.com
/revive-adserver/revive-adserver/issues/1068
issue-tracking, third-party-advisory
-
seclists.org
/fulldisclosure/2021/Jan/60
mailing-list, broken-link, third-party-advisory
-
packetstormsecurity.com
/files/161070/Revive-Adserver-5.0.5-Cross-Site-Scripting-Open-Redirect.html
third-party-advisory, vdb-entry
Sources
- CVE List CVE-2021-22873
- NVD CVE-2021-22873
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