CVE-2021-3777

HIGHNVD 7.57.5—

7.5

nodejs-tmpl is vulnerable to Inefficient Regular Expression Complexity

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 61.8%
KEV: Not listed

Published

September 15, 2021

Last Modified

November 21, 2024

References (4)

security@huntrhttps://github.com/daaku/nodejs-tmpl/commit/4c654e4d1542f329ed561fd95ccd80f30c6872d6
security@huntrhttps://huntr.dev/bounties/a07b547a-f457-41c9-9d89-ee48bee8a4df
af854a3a-2127-422b-91ae-364da2661108https://github.com/daaku/nodejs-tmpl/commit/4c654e4d1542f329ed561fd95ccd80f30c6872d6
af854a3a-2127-422b-91ae-364da2661108https://huntr.dev/bounties/a07b547a-f457-41c9-9d89-ee48bee8a4df

Affected Packages

(1 across 1 ecosystem)

npm(1)

Package	Vulnerable range	Fixed in	Dependents
tmpl	—	1.0.5	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-1333Inefficient Regular Expression Complexity (ReDoS)

Data Freshness Timeline

(refreshed 9× in last 7d / 9× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 10:25 UTCEG score recompute
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-23 12:11 UTCOSV refresh

Frequently asked(5)

What is CVE-2021-3777?

CVE-2021-3777 is a high vulnerability published on September 15, 2021. nodejs-tmpl is vulnerable to Inefficient Regular Expression Complexity

When was CVE-2021-3777 disclosed?

CVE-2021-3777 was first published in the National Vulnerability Database on September 15, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-3777 actively exploited?

CVE-2021-3777 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 61.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-3777?

CVE-2021-3777 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2021-3777?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-3777, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-3777

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