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CVE-2019-25005

24
FAUCET Score

CVE-2019-25005 describes a counter overflow vulnerability in the Rust chacha20 crate prior to version 0.2.3, affecting the chacha20_project. This flaw, rated High severity (CVSS 7.5), allows attackers to more easily determine plaintext due to the counter reset, requiring no user interaction or privileges. Despite its potential for high confidentiality impact, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.2.3CPE matchmatch criteria
cpe:2.3:a:chacha20_project:chacha20:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.31%
Probability of exploitation in next 30 days
EPSS Percentile
67.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0131 is in the 47th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

rustpatch availablevia ghsa
Product: chacha20Fixed in: 0.2.3

Vendor Advisories (1)

rustGHSA-j2r6-2m5c-vgh5high

Counter overflow in chacha20

Aug 25, 2021

References

rustsec.org / advisories/RUSTSEC-2019-0029.html
Third Party Advisory