Microsoft Windows Client Server Runtime Subsystem (CSRSS) Privilege Escalation Vulnerability
Microsoft · Windows
The Windows Client Server Run-time Subsystem (CSRSS) in Microsoft Windows contains a privilege escalation flaw classified as an untrusted search path weakness. A local attacker with low-privileged access who does not need any user interaction can exploit it to elevate their privileges.
Windows Client Server Run-time Subsystem (CSRSS) Elevation of Privilege Vulnerability
- Exploited
- Yes, in CISA KEV
- Reports
- 0
- Tactics
- 5/15
How an attack unfolds
Based on MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. mappings. Select a step to see the evidence.How attackers get in
What they do
What can follow
Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
First seen exploited the day it was disclosed.
CISA KEV listing is when exploitation was confirmed, not necessarily the first attack.
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
4 TechniqueOne specific attacker behaviour in MITRE ATT&CK, such as T1190 “Exploit Public-Facing Application”. IDs with a dot, like T1059.004, are sub-techniques., grouped by TacticThe attacker’s goal at a stage of an attack in MITRE ATT&CK, such as Initial Access or Persistence. Each technique belongs to one or more tactics. in kill-chain order 4Initial AccessTA0001
This vulnerability is exploited by an attacker who has obtained local access tothe target system. The vulnerability lies in the Client Server Run-Time Subsystem (CSRSS) on Windows, specifically in the activation context caching mechanism, due to improper handling of crafted assembly manifests. This vulnerability has been exploited by threat actors to gain elevated privileges on Windows systems. Attackers leveraged this flaw to execute arbitrary system-level commands, allowing them to manipulate system processes and deploy additional malware to perform further malicious activities. The exploit in question is actively being used in the wild, primarily in targeted attacks. It involves creating a malicious activation context by providing a crafted assembly manifest, which is cached and used the next time the process spawns. Once the vulnerability is exploited, attackers can load a malicious DLL to achieve system-level code execution. This allows them to achieve their objectives, such as executing arbitrary code with elevated privileges, with the same permissions as the compromised system's user.
ExecutionTA0002
PersistenceTA0003
Privilege EscalationTA0004
Detection
0 rules for this CVE · 221 general rules for its techniquesRules for this CVE
0Sigma ruleAn open, vendor-neutral detection rule for log data. Security teams convert Sigma rules into searches for their own SIEM. that reference CVE-2022-22047 directly.CVE-specific rules are not available in this build. Search SigmaHQ ↗
General rules for this CVE’s techniques
These detect the technique in general, not this specific vulnerability.
Valid AccountsT107856 general rules
- Win Susp Computer Name Containing Samtheadmincriticaltest
- Account Created And Deleted Within A Close Time Framehightest
- Activity From Anonymous IP Addresshightest
- Atypical Travelhightest
- Azure AD Threat Intelligencehightest
- Azure Subscription Permission Elevation Via AuditLogshightest
- External Remote SMB Logon from Public IPhightest
- Impossible Travelhightest
Exploitation for Privilege EscalationT106831 general rules
- Exploiting CVE-2019-1388criticalstable
- Audit CVE Eventcriticaltest
- HackTool - SysmonEOP Executioncriticaltest
- InstallerFileTakeOver LPE CVE-2021-41379 File Create Eventcriticaltest
- Possible Coin Miner CPU Priority Paramcriticaltest
- Potential CVE-2021-41379 Exploitation Attemptcriticaltest
- Potential SystemNightmare Exploitation Attemptcriticaltest
- Sudo Privilege Escalation CVE-2019-14287 - Builtincriticaltest
Command and Scripting InterpreterT105995 general rules
- HackTool - Sliver C2 Implant Activity Patterncriticaltest
- Lazarus Group Activitycriticaltest
- REvil Kaseya Incident Malware Patternscriticaltest
- Turla Group Lateral Movementcriticaltest
- Windows Defender AMSI Trigger Detectedhighstable
- Windows Defender Threat Detectedhighstable
- Abusable DLL Potential Sideloading From Suspicious Locationhightest
- Add Insecure Download Source To Wingethightest
Registry Run Keys / Startup FolderT1547.00139 general rules
- Leviathan Registry Key Activitycriticaltest
- Potential Ryuk Ransomware Activityhighstable
- File Creation In Suspicious Directory By Msdt.EXEhightest
- Forest Blizzard APT - Custom Protocol Handler Creationhightest
- Forest Blizzard APT - Custom Protocol Handler DLL Registry Sethightest
- Kapeka Backdoor Autorun Persistencehightest
- Modify User Shell Folders Startup Valuehightest
- Narrator's Feedback-Hub Persistencehightest
Sigma rules © SigmaHQ, Detection Rule License 1.1; linked, not reproduced.
What security researchers reported
Not named in any threat report yetAlso mentioned in 50 community threat pulses (AlienVault OTX)
Weaker evidencePulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.
- Actively_Exploited_Kev | Oct 29, 202628 Oct 2026
- Actively_Exploited_Kev | Oct 28, 202627 Oct 2026
- Actively_Exploited_Kev | Oct 27, 202626 Oct 2026
- Actively_Exploited_Kev | Oct 24, 202623 Oct 2026
- Actively_Exploited_Kev | Oct 23, 202622 Oct 2026
- Actively_Exploited_Kev | Oct 22, 202621 Oct 2026
- 44 more on OTX