Skip to content
Fencer Vulns
high 7.5

CVE-2022-39173 json

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

published 2022-09-29 4 y ago modified 2026-07-18 3 mo ago also EUVD-2022-41718 , JLSEC-2026-673

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
5.8%
EPSS 5.8% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

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.

Patch / fix

  • julia wolfSSL_jll 5.7.2+0
  • wolfssl wolfssl 5.5.1
  • wolfssl Debian 13, Debian 12 5.5.3-1

debian advisories DEBIAN-CVE-2022-39173

  • wolfssl Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 5.5.1-r0

alpine advisories ALPINE-CVE-2022-39173

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
17 mo ago

Exploit prediction

5.76% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • packetstormsecurity.com http://packetstormsecurity.com/files/169600/wolfSSL-Buffer-Overflow.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/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

References

Sources

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.