CVE-2021-22960

MEDIUMNVD 6.56.5—

6.5

The parse function in llhttp < 2.1.4 and < 6.0.6. ignores chunk extensions when parsing the body of chunked requests. This leads to HTTP Request Smuggling (HRS) under certain conditions.

CVSS v3: 6.5
EG Score: 6.5(medium)
EPSS: 45.7%
KEV: Not listed

Published

November 3, 2021

Last Modified

November 21, 2024

References (6)

support@hackeronehttps://hackerone.com/reports/1238099
support@hackeronehttps://www.debian.org/security/2022/dsa-5170
support@hackeronehttps://www.oracle.com/security-alerts/cpujan2022.html
af854a3a-2127-422b-91ae-364da2661108https://hackerone.com/reports/1238099
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2022/dsa-5170
af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com/security-alerts/cpujan2022.html

Patch Availability(9)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
redhat	nodejs:12-8040020220523155137.522a0ee4	2022-07-19	redhat
redhat	nodejs:12-8020020220523154454.4cda2c84	2022-06-28	redhat
redhat	nodejs:12-8060020220523160029.ad008a3a	2022-06-21	redhat
redhat	nodejs:12-8010020220518102644.c27ad7f8	2022-06-07	redhat
redhat	rh-nodejs12-nodejs-0:12.22.12-2.el7	2022-06-06	redhat
redhat	nodejs:14-8050020211213115342.c5368500	2022-02-01	redhat
redhat	nodejs:14-8040020211213111158.522a0ee4	2022-01-25	redhat
redhat	rh-nodejs14-nodejs-nodemon-0:2.0.3-6.el7	2022-01-06	redhat
redhat	nodejs:16-8050020211206113934.c5368500	2021-12-16	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

CWE-444Inconsistent Interpretation of HTTP Requests (HTTP Request Smuggling)

All Vendor Advisories

(9)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 11× in last 7d / 20× 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.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 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 08:04 UTCEG score recompute
2026-05-26 08:04 UTCVendor advisory
2026-05-26 08:04 UTCGHSA enrichment
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 16:49 UTCepss_batch

Frequently asked(5)

What is CVE-2021-22960?

CVE-2021-22960 is a medium vulnerability published on November 3, 2021. The parse function in llhttp < 2.1.4 and < 6.0.6. ignores chunk extensions when parsing the body of chunked requests. This leads to HTTP Request Smuggling (HRS) under certain conditions.

When was CVE-2021-22960 disclosed?

CVE-2021-22960 was first published in the National Vulnerability Database on November 3, 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-2021-22960 actively exploited?

CVE-2021-22960 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 45.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-22960?

CVE-2021-22960 has a CVSS v3 base score of 6.5 (NVD).

How do I remediate CVE-2021-22960?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-22960, 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

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CVE-2021-22960

Published

Last Modified

References (6)

Patch Availability(9)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-22960?

Same vendor

Same CWE

CVE-2021-22960

📅 Published

🔄 Last Modified

🔗 References (6)

Patch Availability(9)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-22960?

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References (6)

Frequently asked(5)

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