TI-2022-18557 Aliases CVE-2022-39173 GHSA-ww6v-6x26-hgfc

In wolfSSL before 5.5.1, malicious clients can cause a buffer overflow during a TLS 1.3…

HIGH 66CWE-787Published 2022-09-29 · Updated 2025-05-20

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

In wolfSSL before 5.5.1, malicious clients can cause a buffer overflow during a TLS 1.3 handshake. This occurs when an attacker supposedly resumes a previous TLS session. During the resumption Client Hello a Hello Retry Request must be triggered. Both Client Hellos are required to contain a list of duplicate cipher suites to trigger the buffer overflow. In total, two Client Hellos have to be sent: one in the resumed session, and a second one as a response to a Hello Retry Request message.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.05763 93rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:wolfssl:wolfssl::::::::	before 5.5.1	Vulnerable	wolfSSL

cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:* Versions before 5.5.1 Vulnerable ·wolfSSL

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2022-39173
2026-10-03 Alias added: GHSA-ww6v-6x26-hgfc

References

Exploit 1

http://packetstormsecurity.com/files/169600/wolfSSL-Buffer-Overflow.html

Advisory 3

Other 1

https://blog.trailofbits.com/2023/01/12/wolfssl-vulnerabilities-tlspuffin-fuzzing-ssh/

TI-2024-00830 SEGV and out of bounds memory read from malicious packet CVSS 3.1CRITICAL 9.1
TI-2025-10943 Potential DoS Vulnerability through Multiple KeyShareEntry with Same Group in TLS 1.3 ClientHello CVSS 4.0MEDIUM 6.3
TI-2017-09737 wolfSSL Bleichenbacher/ROBOT CVSS 3.0HIGH 7.5
TI-2019-08902 wolfSSL 4.0.0 has a Buffer Overflow in DoPreSharedKeys in tls13.c when a current identity… CVSS 3.1CRITICAL 9.8
TI-2017-02021 Improper certificate validation in wolfSSL CVSS 3.1CRITICAL 9.8
TI-2022-20901 In wolfSSL before 5.5.2, if callback functions are enabled (via the WOLFSSL_CALLBACKS… CVSS 3.1CRITICAL 9.1

See all 150 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences