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CVE-2021-27519

42
FAUCET Score

CVE-2021-27519 describes a reflected Cross-Site Scripting (XSS) vulnerability in FUDForum version 3.1.0, specifically within the "srch" parameter of the index.php page. This vulnerability carries a CVSS score of 6.1 (Medium), indicating it can be exploited remotely with low attack complexity, requiring user interaction, and potentially leading to low impact on confidentiality and integrity. While not listed in CISA's KEV catalog, public exploit code and Nuclei templates are available, suggesting a higher likelihood of exploitation. Despite this, there is minimal community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
3.1.0CPE matchmatch criteria
cpe:2.3:a:fudforum:fudforum:3.1.0:*:*:*:*:*:*:*

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
7.60%
Probability of exploitation in next 30 days
EPSS Percentile
93.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
Nuclei: CVE-2021-27519 · May 31, 2022
ExploitDB: EDB-49942 · Jun 3, 2021
This CVE's current EPSS score of 0.0760 is in the 97th percentile among its peer group of 26,236 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

packetstormsecurity.com / files/162942/FUDForum-3.1.0-Cross-Site-Scripting.html
ExploitThird Party AdvisoryVDB Entry
github.com / fudforum/FUDforum/issues/2
ExploitIssue TrackingPatchThird Party Advisory