CVE-2021-38512

Exp

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.

Published: 2021-08-10 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-38512 is rated High Exploit Risk (65.3/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.42%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2021-38512

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-38512

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-30 0.88% 0.42% -0.46%
2 2025-03-29 0.38% 0.88% +0.50%
3 2024-12-17 — 0.38% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-38512

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2021-38512

GitHub Security Advisory for CVE-2021-38512

GHSA-8928-2fgm-6x9x · Severity: high · Ecosystem: rust — HTTP Request Smuggling in actix-http

OS Trackers for CVE-2021-38512

vendor priority summary link
redhat medium — https://access.redhat.com/security/cve/CVE-2021-38512

Affected software / configurations for CVE-2021-38512

Vendor Product Version Raw CPE
actix actix-http < 3.0.0 cpe:2.3:a:actix:actix-http:*:*:*:*:*:rust:*:*
actix actix-http 3.0.0 cpe:2.3:a:actix:actix-http:3.0.0:-:*:*:*:rust:*:*
actix actix-http 3.0.0 cpe:2.3:a:actix:actix-http:3.0.0:beta1:*:*:*:rust:*:*
actix actix-http 3.0.0 cpe:2.3:a:actix:actix-http:3.0.0:beta2:*:*:*:rust:*:*
actix actix-http 3.0.0 cpe:2.3:a:actix:actix-http:3.0.0:beta3:*:*:*:rust:*:*
actix actix-http 3.0.0 cpe:2.3:a:actix:actix-http:3.0.0:beta4:*:*:*:rust:*:*
actix actix-http 3.0.0 cpe:2.3:a:actix:actix-http:3.0.0:beta5:*:*:*:rust:*:*
actix actix-http 3.0.0 cpe:2.3:a:actix:actix-http:3.0.0:beta6:*:*:*:rust:*:*
actix actix-http 3.0.0 cpe:2.3:a:actix:actix-http:3.0.0:beta7:*:*:*:rust:*:*
actix actix-http 3.0.0 cpe:2.3:a:actix:actix-http:3.0.0:beta8:*:*:*:rust:*:*
fedoraproject fedora 34 cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*

References for CVE-2021-38512

cvelogic Threat Intelligence