Sigma rule: Pulse Connect Secure RCE Attack CVE-2021-22893

Rule

Title

Pulse Connect Secure RCE Attack CVE-2021-22893

Status

stable

Level

high

Author

Sittikorn S

Date

2021-06-29

Modified

2023-01-02

File

rules-emerging-threats/2021/Exploits/CVE-2021-22893/web_cve_2021_22893_pulse_secure_rce_exploit.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

This rule detects exploitation attempts using Pulse Connect Secure(PCS) vulnerability (CVE-2021-22893)

Log source

category

webserver

Detection

selection1:
    cs-uri-query|contains:
        - '/dana-na/auth/'
        - '/dana-ws/'
        - '/dana-cached/'
selection2:
    cs-uri-query|contains:
        - '?id='
        - '?token='
        - 'Secid_canceltoken.cgi'
        - 'CGI::param'
        - 'meeting'
        - 'smb'
        - 'namedusers'
        - 'metric'
condition: all of selection*

False positives (as the rule lists them)

• Vulnerability Scanning

Tags

• attack.initial-access
• attack.t1190
• cve.2021-22893
• detection.emerging-threats

CVEs this rule names

• CVE-2021-22893

MITRE ATT&CK ids this rule names

• T1190

References

• https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html
• https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2021/Exploits/CVE-2021-22893/web_cve_2021_22893_pulse_secure_rce_exploit.yml