What is CVE-2021-44718?

CVE-2021-44718 is a medium-severity vulnerability in Wolfssl, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.9/10. Published 2022-09-02.

How severe is CVE-2021-44718?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Wolfssl

CVE-2021-44718

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.

Published 2022-09-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (52.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: +0.000

Affected products

Wolfssl

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

www.wolfssl.com/docs/security-vulnerabilities/ (Vendor Advisory)
github.com/wolfSSL/wolfssl/releases (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2021-44718?: CVE-2021-44718 is a medium-severity vulnerability in Wolfssl, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.9/10. Published 2022-09-02.
How severe is CVE-2021-44718?: Medium severity. CVSS v3 base score is 5.9 out of 10.