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CVE-2021-3777

25
FAUCET Score

CVE-2021-3777 describes an Inefficient Regular Expression Complexity vulnerability (ReDoS) in the nodejs-tmpl library, affecting the tmpl_project tmpl product. This vulnerability carries a CVSS score of 7.5 (High), indicating it can be exploited remotely with low attack complexity, potentially leading to a denial-of-service (DoS) condition. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.0.5CPE matchmatch criteria
cpe:2.3:a:tmpl_project:tmpl:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.30%
Probability of exploitation in next 30 days
EPSS Percentile
67.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0130 is in the 47th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 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 (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: tmplFixed in: 1.0.5

Vendor Advisories (1)

npmGHSA-jgrx-mgxx-jf9vhigh

tmpl vulnerable to Inefficient Regular Expression Complexity which may lead to resource exhaustion

Sep 20, 2021

References

github.com / daaku/nodejs-tmpl/commit/4c654e4d1542f329ed561fd95ccd80f30c6872d6
PatchThird Party Advisory
huntr.dev / bounties/a07b547a-f457-41c9-9d89-ee48bee8a4df
ExploitIssue TrackingPatchThird Party Advisory