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CVE-2021-38189

nvd nist
Published: Aug 8, 2021Modified: Jun 17, 2026

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9.8
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitability: 3.9 / Impact: 5.9
Source: NVD

Description

An issue was discovered in the lettre crate before 0.9.6 for Rust. In an e-mail message body, an attacker can place a . character after two <CR><LF> sequences and then inject arbitrary SMTP commands.

Affected (12)

Products: Lettre: Lettre
Lettre
1 product
Lettre
Configuration A
12 vulnerable
Vulnerable SoftwareAffected Versions
Lettre
Lettre
Before 0.9.6
Lettre
Version 0.10.0 alpha1
Lettre
Version 0.10.0 alpha2
Lettre
Version 0.10.0 alpha3
Lettre
Version 0.10.0 alpha4
Lettre
Version 0.10.0 alpha5
Lettre
Version 0.10.0 beta1
Lettre
Version 0.10.0 beta2
Lettre
Version 0.10.0 beta3
Lettre
Version 0.10.0 beta4
Lettre
Version 0.10.0 rc1
Lettre
Version 0.10.0 rc2

Related CWEs

CWE-77
Improper Neutralization of Special Elements used in a Command ('Command Injection')
The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

References (4)

Source: cve@mitre.org
Third Party Advisory
Source: cve@mitre.org
ExploitIssue TrackingPatchThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
ExploitIssue TrackingPatchThird Party Advisory

Timeline

No history available yet.