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CVE-2021-22889

37
FAUCET Score

CVE-2021-22889 describes a reflected Cross-Site Scripting (XSS) vulnerability in Revive Adserver versions prior to 5.2.0, specifically within the stats.php script's statsBreakdown parameter. An attacker could exploit this by crafting a malicious URL and tricking an authenticated user into clicking it, potentially leading to the execution of arbitrary JavaScript code within their browser session. This vulnerability carries a CVSS v3.1 score of 6.1 (Medium), indicating a network-based attack with low complexity, requiring user interaction, and resulting in low impact to confidentiality and integrity. Its EPSS score is low, suggesting a minimal likelihood of exploitation in the wild. Currently, there is no public exploit code available (Metasploit, Nuclei, ExploitDB), and it is not listed on the CISA KEV catalog, indicating no active exploitation. Community discussion and media coverage for this CVE are also minimal, suggesting a low level of public attention.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.2.0CPE 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
36.33%
Probability of exploitation in next 30 days
EPSS Percentile
98.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.3633 is in the 99th 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

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / revive-adserver/revive-adserver/commit/2f868414
PatchThird Party Advisory
hackerone.com / reports/1097217
ExploitThird Party Advisory
revive-adserver.com / security/revive-sa-2021-003
Vendor Advisory