CVE catalog
CVE-2021-44718
wolfssl: CVE-2021-44718
- Severity
- Medium
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.74% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | wolfssl | sid | 5.9.2-1.2 | fixed |
| Debian | wolfssl | trixie | 5.7.2-0.1+deb13u2 | fixed |
| Debian | wolfssl | bookworm | 5.5.4-2+deb12u2 | fixed |
| Debian | wolfssl | bookworm-security | 5.5.4-2+deb12u3 | fixed |
| Ubuntu | wolfssl | 16.04 | 3.4.8+dfsg-1 | vulnerable |
| Ubuntu | wolfssl | 18.04 | 3.10.2+dfsg-2 | vulnerable |
| Ubuntu | wolfssl | 18.04 | 3.12.0+dfsg-1 | vulnerable |
| Ubuntu | wolfssl | 18.04 | 3.12.2+dfsg-1 | vulnerable |
| Ubuntu | wolfssl | 18.04 | 3.13.0+dfsg-1 | vulnerable |
| Ubuntu | wolfssl | 20.04 | 4.1.0+dfsg-2 | vulnerable |
| Ubuntu | wolfssl | 20.04 | 4.2.0+dfsg-1 | vulnerable |
| Ubuntu | wolfssl | 20.04 | 4.2.0+dfsg-2 | vulnerable |
| Ubuntu | wolfssl | 20.04 | 4.2.0+dfsg-3 | vulnerable |
| Ubuntu | wolfssl | 20.04 | 4.3.0+dfsg-2 | vulnerable |
| Ubuntu | wolfssl | 22.04 | 4.6.0-3 | vulnerable |
| Ubuntu | wolfssl | 22.04 | 5.0.0-1 | vulnerable |
| Ubuntu | wolfssl | 22.04 | 5.1.1-1 | vulnerable |
| Ubuntu | wolfssl | 22.04 | 5.2.0-1 | vulnerable |
| Ubuntu | wolfssl | 22.04 | 5.2.0-2 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | wolfssl | source | sid | 5.1.1-1 | not yet assigned | Not reported | Not reported |
| Debian | wolfssl | source | trixie | 5.1.1-1 | not yet assigned | Not reported | Not reported |
| Debian | wolfssl | source | bookworm | 5.1.1-1 | not yet assigned | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libwolfssl35]Fixed
Source package: [wolfssl]
Details (4)
5.5.4-2+deb12u2· amd64 · bookwormFixed · Fixed:
5.1.1-1dsa · wolfssl · debian · bookworm; dsa · wolfssl · debian · 12
5.5.4-2+deb12u2· arm64 · bookwormFixed · Fixed:
5.1.1-1dsa · wolfssl · debian · bookworm; dsa · wolfssl · debian · 12
5.5.4-2+deb12u3· amd64 · bookworm-securityFixed · Fixed:
5.1.1-1dsa · wolfssl · debian · bookworm; dsa · wolfssl · debian · 12
5.5.4-2+deb12u3· arm64 · bookworm-securityFixed · Fixed:
5.1.1-1dsa · wolfssl · debian · bookworm; dsa · wolfssl · debian · 12
- [libwolfssl-dev]Fixed
Source package: [wolfssl]
Details (4)
5.5.4-2+deb12u2· amd64 · bookwormFixed · Fixed:
5.1.1-1dsa · wolfssl · debian · bookworm; dsa · wolfssl · debian · 12
5.5.4-2+deb12u2· arm64 · bookwormFixed · Fixed:
5.1.1-1dsa · wolfssl · debian · bookworm; dsa · wolfssl · debian · 12
5.5.4-2+deb12u3· amd64 · bookworm-securityFixed · Fixed:
5.1.1-1dsa · wolfssl · debian · bookworm; dsa · wolfssl · debian · 12
5.5.4-2+deb12u3· arm64 · bookworm-securityFixed · Fixed:
5.1.1-1dsa · wolfssl · debian · bookworm; dsa · wolfssl · debian · 12
[Debian 13 (Trixie)]
- [libwolfssl42t64]Fixed
Source package: [wolfssl]
Details (2)
5.7.2-0.1+deb13u1· amd64 · trixieFixed · Fixed:
5.1.1-1dsa · wolfssl · debian · 13
5.7.2-0.1+deb13u1· arm64 · trixieFixed · Fixed:
5.1.1-1dsa · wolfssl · debian · 13
- [libwolfssl-dev]Fixed
Source package: [wolfssl]
Details (2)
5.7.2-0.1+deb13u1· amd64 · trixieFixed · Fixed:
5.1.1-1dsa · wolfssl · debian · 13
5.7.2-0.1+deb13u1· arm64 · trixieFixed · Fixed:
5.1.1-1dsa · wolfssl · debian · 13
Observed: