Vulnerability in Github.com/flynn/noise
CVE-2021-4239
The Noise protocol implementation suffers from weakened cryptographic security after encrypting 2^64 messages, and a potential denial of service attack. After 2^64 (~18.4 quintillion) messages are encrypted with the Encrypt function, the nonce counter will wrap around, causing multiple messages to be encrypted with the same key and nonce. In a separate issue, the Decrypt function increments the nonce state even when it fails to decrypt a message. If an attacker can provide an invalid input to the Decrypt function, this will cause the nonce state to desynchronize between the peers, resulting in a failure to encrypt all subsequent messages.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (26.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Github.com/flynn/noise — versions 0
- Noiseprotocol Noise
Weakness classification (CWE)
References
- github.com/flynn/noise/pull/44 (Patch, Third Party Advisory)
- pkg.go.dev/vuln/GO-2022-0425 (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-4239?
- CVE-2021-4239 is a high-severity vulnerability in Github.com/flynn/noise, classified under Missing Encryption of Sensitive Data. CVSS score: 7.5/10. Published 2022-12-27.
- How severe is CVE-2021-4239?
- High severity. CVSS v3 base score is 7.5 out of 10.