Skip to main content
Public proof of conceptFix available

CVE-2022-39173

A public proof of concept exists; no exploitation attested.

  • Published2022-09-29
  • Fixed in5.5.1
  • WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2022-09-2901:15CVE publishedNVD

Versions per branch

NVD
Wolfssl
BranchAffectedFixed in
5.5< 5.5.15.5.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • wolfsslUbuntu:26.10all versions · no fixed version listed
  • wolfsslUbuntu:26.04:LTSall versions · no fixed version listed
  • wolfsslUbuntu:25.10all versions · no fixed version listed
  • wolfsslUbuntu:24.04:LTSall versions · no fixed version listed
  • wolfsslUbuntu:22.04:LTSall versions · no fixed version listed
  • wolfsslUbuntu:20.04:LTSall versions · no fixed version listed
  • wolfsslUbuntu:18.04:LTSall versions · no fixed version listed
  • wolfsslUbuntu:16.04:LTSall versions · no fixed version listed

11 more package ranges on OSV.dev

Full record on NVD

Fix

  1. Update Wolfssl to 5.5.1

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2022-09-29
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-ww6v-6x26-hgfc

Frequently asked questions

What is CVE-2022-39173?

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.

Is CVE-2022-39173 actively exploited?

A proof-of-concept exploit exists for CVE-2022-39173, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2022-39173?

CVE-2022-39173 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Running wolfssl? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, November 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database

Sources for this record