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CVE-2021-22873

68
FAUCET Score

CVE-2021-22873 describes an open redirect vulnerability in Revive Adserver versions prior to 5.1.0, affecting the lg.php and ck.php delivery scripts through the 'dest', 'oadest', and 'ct0' parameters. This vulnerability, previously a design feature for third-party ad tracking, was reclassified as a security flaw due to changes in industry practices. With a CVSS score of 6.1 (Medium), it can be exploited remotely with low attack complexity, requiring user interaction, and potentially leading to information disclosure and integrity impacts. While there is no evidence of active exploitation or Metasploit modules, Nuclei templates exist, and the vulnerability has not garnered significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.1.0CPE matchmatch criteria
cpe:2.3:a:revive-adserver:revive_adserver:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
69.64%
Probability of exploitation in next 30 days
EPSS Percentile
99.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Nuclei: CVE-2021-22873 · Jan 24, 2021
This CVE's current EPSS score of 0.6964 is in the 100th percentile among its peer group of 26,221 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Remediation records are not available for this CVE.

References

packetstormsecurity.com / files/161070/Revive-Adserver-5.0.5-Cross-Site-Scripting-Open-Redirect.html
Third Party AdvisoryVDB Entry
seclists.org / fulldisclosure/2021/Jan/60
Broken LinkMailing ListThird Party Advisory
github.com / revive-adserver/revive-adserver/issues/1068
Issue TrackingThird Party Advisory
hackerone.com / reports/1081406
ExploitThird Party Advisory
revive-adserver.com / security/revive-sa-2021-001
Vendor Advisory