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CVE-2021-3734

27
FAUCET Score

CVE-2021-3734 is a high-severity vulnerability affecting yourls, stemming from improper restriction of rendered UI layers or frames (CWE-1021) and cross-site request forgery (CWE-352). With a CVSS score of 8.8, it allows unauthenticated attackers to achieve high impact on confidentiality, integrity, and availability through a low-complexity network attack requiring user interaction. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.8.1CPE matchmatch criteria
cpe:2.3:a:yourls:yourls:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
2.5
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.40%
Probability of exploitation in next 30 days
EPSS Percentile
33.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0040 is in the 37th percentile among its peer group of 14,824 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-r6g8-jmj9-g945medium

Improper Restriction of Rendered UI Layers or Frames in yourls

Aug 30, 2021

References

github.com / yourls/yourls/commit/0a70acdcfb5fcbc63dbc5750018d608288eba3fe
PatchThird Party Advisory
huntr.dev / bounties/dd2e2dbe-efe5-49ec-be11-7a7e7c41debd
ExploitIssue TrackingThird Party Advisory