CVE-2021-34801

FAUCET Score

CVE-2021-34801 describes a denial-of-service vulnerability in Valine 1.4.14, where a remote attacker can crash the application by providing a malformed User-Agent string containing only product and version information. With a CVSS score of 5.3 (Medium), this vulnerability is easily exploitable over the network with low attack complexity and no user interaction, leading to an application outage. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		1.4.14CPE matchmatch criteria	cpe:2.3:a:valine.js:valine:1.4.14:::::::*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

Exploitability Score

3.9

Impact Score

1.4

CvssVersion

3.1

Exploit Intelligence

EPSS Score

1.72%

Probability of exploitation in next 30 days

EPSS Percentile

75.1%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0172 is in the 61st percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Vendor Advisories (1)

npmGHSA-p2c4-gxp4-j3xpmedium

Denial of service in Valine

Jun 21, 2021

References

github.com / xCss/Valine/issues/366

ExploitIssue TrackingThird Party Advisory