THREATPORT/VULNERABILITY/CVE-2022-39173
HIGH SEVERITY

CVE-2022-39173

Wolfssl vulnerability

CVSS
7.5
EPSS
4.3%
EPSS pct
90th
Exploited
No known
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.
Affected vendor
Wolfssl
Affected product
Wolfssl
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness type (CWE)
Published
2022-09-29

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 4.3% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 90% of all scored CVEs.

Check your external exposure to CVE-2022-39173

  • Confirm whether Wolfssl Wolfssl is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2022-39173.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2022-39173

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2022-39173 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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