CVE-2021-44718 json
wolfSSL through 5.0.0 allows an attacker to cause a denial of service and infinite loop in the client component by sending crafted traffic…
published 2022-09-02 4 y ago modified 2026-07-18 3 mo ago also EUVD-2021-31533 , JLSEC-2026-668
- cvss
- 5.9
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 56%
- public exploits
- 0
- none known
Summary
wolfSSL through 5.0.0 allows an attacker to cause a denial of service and infinite loop in the client component by sending crafted traffic from a Machine-in-the-Middle (MITM) position. The root cause is that the client module accepts TLS messages that normally are only sent to TLS servers.
Patch / fix
- julia wolfSSL_jll 5.7.2+0
- wolfssl Debian 13, Debian 12 5.1.1-1
debian advisories DEBIAN-CVE-2021-44718
Exploit prediction
0.79% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
| OSV | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| julia | wolfSSL_jll | <5.7.2+0 |
5.7.2+0 |
Classification
- Weakness
-
- CWE-835 Loop with Unreachable Exit Condition
References
-
wolfssl.com
/docs/security-vulnerabilities/
vendor-advisory, web
-
github.com
/wolfSSL/wolfssl/releases
release-notes, third-party-advisory, web
Sources
- CVE List CVE-2021-44718
- NVD CVE-2021-44718
- OSV JLSEC-2026-668
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.