CVE-2023-45236 — EDK2's Network Package is susceptible to a predictable TCP Initial Sequence Numb

EDK2's Network Package is susceptible to a predictable TCP Initial Sequence Number. This vulnerability can be exploited by an attacker to gain unauthorized access and potentially lead to a loss of Confidentiality.

01What is this vulnerability?

EDK2's Network Package is susceptible to a predictable TCP Initial Sequence Number. This vulnerability can be exploited by an attacker to gain unauthorized access and potentially lead to a loss of Confidentiality.

02Affected products

Vendor	Product	Versions
TianoCore	edk2	edk2-stable202308

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2024-01-16T16:10:38.262Z
• Last modified: 2025-11-04T18:17:41.127Z

09References

• github.com — https://github.com/tianocore/edk2/security/advisories/GHSA-hc6x-cw6p-gj7h
• www.openwall.com — http://www.openwall.com/lists/oss-security/2024/01/16/2
• security.netapp.com — https://security.netapp.com/advisory/ntap-20240307-0011/