OnlyPatch
Windows IKE Extension

CVE-2022-34721 — Windows Internet Key Exchange (IKE) Protocol Extensions Remote Code Execution Vulnerability

Critical CVSS 9.8 EPSS 0.7855 🔬 Patch diffed 2022-09 archive

Executive Summary

None

Overview

9.8
CVSS CRITICAL
Critical
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Remote Code Execution
Released Sep 13 2022
Last Updated Sep 13 2022
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.7855 — 0.99547 percentile
NVD CVSS 9.8 CRITICAL — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 8.5

EPSS Score

0.7855
probability of exploitation in the next 30 days
0.99547 percentile - updated 2026-08-14
View on FIRST.org

Affected Products

22 affected products
Product KB Article Severity Impact Restart Required
Windows 10 for 32-bit Systems 5017327 (Security Update) Critical Remote Code Execution Yes
Windows 10 for x64-based Systems 5017327 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1607 for 32-bit Systems 5017305 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1607 for x64-based Systems 5017305 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1809 for 32-bit Systems 5017315 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1809 for ARM64-based Systems 5017315 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1809 for x64-based Systems 5017315 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 20H2 for 32-bit Systems 5017308 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 20H2 for ARM64-based Systems 5017308 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 21H1 for 32-bit Systems 5017308 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 21H1 for ARM64-based Systems 5017308 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 21H1 for x64-based Systems 5017308 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 21H2 for 32-bit Systems 5017308 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 21H2 for ARM64-based Systems 5017308 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 21H2 for x64-based Systems 5017308 (Security Update) Critical Remote Code Execution Yes
Windows 11 version 21H2 for ARM64-based Systems 5017328 (Security Update) Critical Remote Code Execution Yes
Windows 11 version 21H2 for x64-based Systems 5017328 (Security Update) Critical Remote Code Execution Yes
Windows 7 for 32-bit Systems Service Pack 1 5017361 (Monthly Rollup) 5017373 (Security Only) Critical Remote Code Execution 5016676 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.1.7601.26115 Yes 5017361 5017373 Windows 7 for x64-based Systems Service Pack 1 5017361 (Monthly Rollup) 5017373 (Security Only) Critical Remote Code Execution 5016676 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.1.7601.26115 Yes 5017361 5017373 Windows 8.1 for 32-bit systems 5017367 (Monthly Rollup) 5017365 (Security Only) Critical Remote Code Execution 5016681 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.20571 Yes 5017367 5017365 Windows 8.1 for x64-based systems 5017367 (Monthly Rollup) 5017365 (Security Only) Critical Remote Code Execution 5016681 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.20571 Yes 5017367 5017365 Windows RT 8.1 5017367 (Monthly Rollup) Critical Remote Code Execution Yes
Windows Server 2008 for 32-bit Systems Service Pack 2 5017358 (Monthly Rollup) 5017371 (Security Only) Critical Remote Code Execution 5016669 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21666 Yes 5017358 5017371 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 5017358 (Monthly Rollup) 5017371 (Security Only) Critical Remote Code Execution 5016669 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21666 Yes 5017358 5017371 Windows Server 2008 for x64-based Systems Service Pack 2 5017358 (Monthly Rollup) 5017371 (Security Only) Critical Remote Code Execution 5016669 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21666 Yes 5017358 5017371 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 5017358 (Monthly Rollup) 5017371 (Security Only) Critical Remote Code Execution 5016669 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21666 Yes 5017358 5017371 Windows Server 2008 R2 for x64-based Systems Service Pack 1 5017361 (Monthly Rollup) 5017373 (Security Only) Critical Remote Code Execution 5016676 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.1.7601.26115 Yes 5017361 5017373 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 5017361 (Monthly Rollup) 5017373 (Security Only) Critical Remote Code Execution 5016676 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.1.7601.26115 Yes 5017361 5017373 Windows Server 2012 5017370 (Monthly Rollup) 5017377 (Security Only) Critical Remote Code Execution 5016672 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.2.9200.23865 Yes 5017370 5017377 Windows Server 2012 (Server Core installation) 5017370 (Monthly Rollup) 5017377 (Security Only) Critical Remote Code Execution 5016672 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.2.9200.23865 Yes 5017370 5017377 Windows Server 2012 R2 5017367 (Monthly Rollup) 5017365 (Security Only) Critical Remote Code Execution 5016681 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.20571 Yes 5017367 5017365 Windows Server 2012 R2 (Server Core installation) 5017367 (Monthly Rollup) 5017365 (Security Only) Critical Remote Code Execution 5016681 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.20571 Yes 5017367 5017365 Windows Server 2016 5017305 (Security Update) Critical Remote Code Execution Yes
Windows Server 2016 (Server Core installation) 5017305 (Security Update) Critical Remote Code Execution Yes
Windows Server 2019 5017315 (Security Update) Critical Remote Code Execution Yes
Windows Server 2019 (Server Core installation) 5017315 (Security Update) Critical Remote Code Execution Yes

Patches

6 patches
Article Type Restart
5017327 Security Update Yes
5017305 Security Update Yes
5017315 Security Update Yes
5017308 Security Update Yes
5017328 Security Update Yes
5017367 Monthly Rollup Yes

Patch Diff

ghidriff · ikeext.dll (KB5017305)

Heap out-of-bounds read in Windows IKEv2 extension (ikeext.dll). IkeQueueRecvRequest allocates a WFP memory buffer via WfpMemAlloc using an unchecked bufferSize derived from attacker-controlled IKEv2 fragment headers. During reassembly, the code copies merged fragment data and later accesses the buffer at offset [3], causing an out-of-bounds read. Reachable via UDP/500 IKEv2 fragmentation payload.

Pre-patch version 10.0.22000.708
Post-patch version 10.0.22000.978
Function Address Change Note
IkeQueueRecvRequest modified Added bounds validation on bufferSize derived from IKEv2 fragment headers before WfpMemAlloc
View full diff report View RCA report Download PoC

Attack Path

Heap out-of-bounds read from IKEv2 fragment reassembly with an unchecked buffer size

Attack path for CVE-2022-34721 Heap out-of-bounds read from IKEv2 fragment reassembly with an unchecked buffer size 01 — ENTRY Attacker sends fragmented IKEv2 traffic to UDP/500 Remote, pre-authentication, same exposed IKE surface as CVE-2022-21849. 02 — CONTROLLED INPUT Fragment headers carry the size used for the reassembly allocation bufferSize is derived from attacker-controlled IKEv2 fragment header fields. 03 — PATH IkeQueueRecvRequest allocates a WFP buffer and merges the fragments into it WfpMemAlloc is called with the derived size, then merged fragment data is copied in. 04 — MISSING CHECK bufferSize is never validated before WfpMemAlloc A size smaller than what reassembly needs leaves later access at offset [3] reading past the allocation. The patch adds bounds validation on bufferSize before the allocation. 05 — PRIMITIVE Out-of-bounds heap read in a network-facing kernel component Read-only OOB - crash or information disclosure depending on adjacent heap contents.

Derived from the patch delta: the checks added by the vendor identify which fields crossed a trust boundary unvalidated. Reachability and privilege are taken from the call chain in the RCA report.

Known Exploits

Acknowledgments

Yuki Chen

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