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CVE-2021-38187

31
FAUCET Score

CVE-2021-38187 is a critical soundness vulnerability affecting the anymap crate through version 0.12.1 for Rust, specifically due to an unsafe conversion from *u8 to *u64. With a CVSS score of 9.8, this vulnerability poses a severe risk, allowing for complete compromise of confidentiality, integrity, and availability with low attack complexity and no user interaction required. While there is no evidence of active exploitation, no public exploit code, and it is not listed in CISA's KEV catalog, the vulnerability has garnered significant community discussion, indicating awareness among security researchers.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.12.1CPE matchmatch criteria
cpe:2.3:a:anymap_project:anymap:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.44%
Probability of exploitation in next 30 days
EPSS Percentile
70.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0144 is in the 57th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

rustGHSA-hc92-9h3m-c39jcritical

Incorrect cast in anymap

Aug 25, 2021

References

raw.githubusercontent.com / rustsec/advisory-db/main/crates/anymap/RUSTSEC-2021-0065.md
Third Party Advisory
rustsec.org / advisories/RUSTSEC-2021-0065.html
ExploitIssue TrackingPatchThird Party Advisory