CVE-2021-38196

moderate-risk

Published 2021-08-08

An issue was discovered in the better-macro crate through 2021-07-22 for Rust. It intentionally demonstrates that remote attackers can execute arbitrary code via proc-macros, and otherwise has no legitimate purpose.

Do I need to act?

3.4% chance of exploitation in next 30 days

EPSS score — moderate exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 9.8/10 Critical

NETWORK / LOW complexity

Affected Products (1)

Better-Macro

Affected Vendors

Better-Macro Project

References (4)

Third Party Advisory https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/better-macro/R...

Exploit https://rustsec.org/advisories/RUSTSEC-2021-0077.html

Third Party Advisory https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/better-macro/R...

Exploit https://rustsec.org/advisories/RUSTSEC-2021-0077.html

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moderate-risk

Severity 32/34 · Critical

Exploitability 7/34 · Low

Exposure 5/34 · Minimal