Unauthenticated Nonce Increment in snow

published 2024-01-23 2 y ago modified 2026-10-12 27 d ago also GHSA-7g9j-g5jg-3vv3 , RUSTSEC-2024-0011 , EUVD-2024-54824

cvss: 3.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits: 0; none known

The snow crate before 0.9.5 for Rust, when stateful TransportState is used, allows incrementing a nonce and thereby denying message delivery.

Patch / fix

fixed in 2 distros 1 links 1

crates.io snow 0.9.5
mcginty snow 0.9.5

rust-snow Debian 14, Debian 13 0.9.6-1

debian advisories DEBIAN-CVE-2024-58265

github.com/mcginty/snow@12e8ae5 commit

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 15 mo ago (2025-07-28)

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	3.1	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
NVD	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
GitHub	3.1	3.1	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem	package	affected	fixed in
crates.io	snow	<0.9.5 >=0.0.0-0, <0.9.5	0.9.5

Affected products

mcginty snow

Classification

Weakness

CWE-642 External Control of Critical State Data
CWE-440 Expected Behavior Violation

References

github.com /mcginty/snow/commit/12e8ae55547ae297d5f70599e5c884ea891303eb
web
github.com /mcginty/snow/security/advisories/GHSA-7g9j-g5jg-3vv3
web, vendor-advisory
rustsec.org /advisories/RUSTSEC-2024-0011.html
web, third-party-advisory, advisory
crates.io /crates/snow
product, package
nvd.nist.gov /vuln/detail/CVE-2024-58265
advisory
github.com /mcginty/snow
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary