CVE-2021-38512

HIGHNVD 7.57.5—

7.5

An issue was discovered in the actix-http crate before 3.0.0-beta.9 for Rust. HTTP/1 request smuggling (aka HRS) can occur, potentially leading to credential disclosure.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 62.2%
KEV: Not listed

Published

August 10, 2021

Last Modified

November 21, 2024

References (6)

cve@mitrehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/67URRW4K47SR6LNQB4YALPLGGQMQK7HO/
cve@mitrehttps://raw.githubusercontent.com/rustsec/advisory-db/main/crates/actix-http/RUSTSEC-2021-0081.md
cve@mitrehttps://rustsec.org/advisories/RUSTSEC-2021-0081.html
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/67URRW4K47SR6LNQB4YALPLGGQMQK7HO/
af854a3a-2127-422b-91ae-364da2661108https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/actix-http/RUSTSEC-2021-0081.md
af854a3a-2127-422b-91ae-364da2661108https://rustsec.org/advisories/RUSTSEC-2021-0081.html

Affected Packages

(1 across 1 ecosystem)

crates.io(1)

Package	Vulnerable range	Fixed in	Dependents
actix-http	—	3.0.0-beta.9	—

Weakness Classification(1)

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

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

Data Freshness Timeline

(refreshed 8× in last 7d / 8× 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
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 12:19 UTCEG score recompute
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-38512?

CVE-2021-38512 is a high vulnerability published on August 10, 2021. An issue was discovered in the actix-http crate before 3.0.0-beta.9 for Rust. HTTP/1 request smuggling (aka HRS) can occur, potentially leading to credential disclosure.

When was CVE-2021-38512 disclosed?

CVE-2021-38512 was first published in the National Vulnerability Database on August 10, 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-2021-38512 actively exploited?

CVE-2021-38512 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 62.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-38512?

CVE-2021-38512 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2021-38512?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-38512, 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-2021-38512

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