CVE-2021-38187
Incorrect cast in anymap
An issue was discovered in the anymap crate through 0.12.1 for Rust. It violates soundness via conversion of a *u8 to a *u64.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
An issue was discovered in the anymap crate through 0.12.1 for Rust. It violates soundness via conversion of a *u8 to a *u64.
- Record
CVE-2021-38187- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-681
- Updated
- 2026-11-02
CVE List No score
An issue was discovered in the anymap crate through 0.12.1 for Rust. It violates soundness via conversion of a *u8 to a *u64.
- Record
CVE-2021-38187- Updated
- 2026-11-02
EUVDEUVD-2021-1744 No score
An issue was discovered in the anymap crate through 0.12.1 for Rust. It violates soundness via conversion of a *u8 to a *u64.
- Record
EUVD-2021-1744- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-hc92-9h3m-c39j
Incorrect cast in anymap
An issue was discovered in the anymap crate through 0.12.1 for Rust. It violates soundness via conversion of a *u8 to a *u64.
- Record
GHSA-hc92-9h3m-c39j- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-681, CWE-704
- Updated
- 2026-11-02
OSV
An issue was discovered in the anymap crate through 0.12.1 for Rust. It violates soundness via conversion of a *u8 to a *u64.
- Record
CVE-2021-38187- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2021-38187
An issue was discovered in the anymap crate through 0.12.1 for Rust. It violates soundness via conversion of a *u8 to a *u64.
- Record
DEBIAN-CVE-2021-38187- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVGHSA-hc92-9h3m-c39j
Incorrect cast in anymap
An issue was discovered in the anymap crate through 0.12.1 for Rust. It violates soundness via conversion of a *u8 to a *u64.
- Record
GHSA-hc92-9h3m-c39j- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-681, CWE-704
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-38187
An issue was discovered in the anymap crate through 0.12.1 for Rust. It violates soundness via conversion of a *u8 to a *u64.
- Record
UBUNTU-CVE-2021-38187- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVRUSTSEC-2021-0065 No score
anymap is unmaintained.
The anymap crate does not appear to be maintained, and the most recent
published version 0.12.1 includes a soundness bug. This has been
fixed a few years ago, but
was never released.
- Record
RUSTSEC-2021-0065- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
anymapcrates.io |
through 0.12.1 | None known |
rust-anymapDebian:11 |
All versions, plus listed versions 0.12.1-1 |
None known |
anymapcrates.io |
0.0.0-0 and later | None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-38187 is a critical vulnerability (CVSS 9.8) in Anymap Project Anymap, published May 7, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.44%, the 73rd percentile. No source names a fixed version.
References
rustsec.org/advisories/RUSTSEC-2021-0065.html
raw.githubusercontent.com/rustsec/advisory-db/main/crates/anymap/RUSTSEC-2021-0065.md
nvd.nist.gov/vuln/detail/CVE-2021-38187
github.com/chris-morgan/anymap/issues/37
security-tracker.debian.org/tracker/CVE-2021-38187