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Exploited vulnerability · CISA KEV

Is CVE-2021-22900 exploited? Yes: in CISA KEV since 3 Nov 2021

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

Yes. CVE-2021-22900, Ivanti Pulse Connect Secure Unrestricted File Upload Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 160 days after it was published. 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
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity7.2CVSS 3.1 · high
US federal due3 May 2022BOD 22-01 deadline

What it is

Ivanti Pulse Connect Secure contains an unrestricted file upload vulnerability that allows an authenticated administrator to perform a file write via a maliciously crafted archive upload in the administrator web interface.

VendorIvanti (38 exploited CVEs in KEV)
ProductPulse Connect Secure
VulnerabilityIvanti Pulse Connect Secure Unrestricted File Upload Vulnerability
WeaknessCWE-94
Published27 May 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 27 May 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-2021-22900 being exploited?

Yes. CISA added CVE-2021-22900 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-22900 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2021-22900?

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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