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Exploited vulnerability · CISA KEV

Is CVE-2021-22893 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Ivanti Pulse Connect Secure · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-22893, Ivanti Pulse Connect Secure Use-After-Free Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 194 days after it was published. It is known to be used in ransomware campaigns. It affects Ivanti Pulse Connect Secure, an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Nov 2021
ransomwareKnownused in campaigns
EPSStop 5%very likely to be exploited
severity10CVSS 3.1 · critical
US federal due3 May 2022BOD 22-01 deadline

What it is

Ivanti Pulse Connect Secure contains a use-after-free vulnerability that allow a remote, unauthenticated attacker to execute code via license services.

VendorIvanti (38 exploited CVEs in KEV)
ProductPulse Connect Secure
VulnerabilityIvanti Pulse Connect Secure Use-After-Free Vulnerability
WeaknessCWE-287
Published23 Apr 2021
Added to KEV3 Nov 2021
Reported by (CNA)hackerone

What to do

  1. Check whether you run it. Look for Pulse Connect Secure in your asset inventory, including appliances and cloud images. Stack check lists every exploited Ivanti CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 23 Apr 2021.
  4. Get told next time. Email alerts when CISA adds a CVE for Ivanti.

Other exploited CVEs in Pulse Connect Secure

Questions

Is CVE-2021-22893 being exploited?

Yes. CISA added CVE-2021-22893 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-22893 used in ransomware attacks?

Yes, CISA lists it as known to be used in ransomware campaigns.

How do I fix CVE-2021-22893?

Apply updates per vendor instructions. Check Ivanti's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Pulse Connect Secure and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in November 2021 · Ivanti scorecard · act-now radar.

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