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Exploited vulnerability · CISA KEV

Is CVE-2020-2021 exploited? Yes: in CISA KEV since 25 Mar 2022

Gociux · Palo Alto Networks PAN-OS · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2020-2021, Palo Alto Networks PAN-OS Authentication Bypass Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 25 Mar 2022, 634 days after it was published. It is known to be used in ransomware campaigns. It affects Palo Alto Networks PAN-OS, 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 · 25 Mar 2022
ransomwareKnownused in campaigns
EPSStop 10%more likely than most to be exploited
severity10CVSS 3.1 · critical
US federal due15 Apr 2022BOD 22-01 deadline

What it is

Palo Alto Networks PAN-OS contains a vulnerability in SAML which allows an attacker to bypass authentication.

VendorPalo Alto Networks (16 exploited CVEs in KEV)
ProductPAN-OS
VulnerabilityPalo Alto Networks PAN-OS Authentication Bypass Vulnerability
WeaknessCWE-347
Published29 Jun 2020
Added to KEV25 Mar 2022
Reported by (CNA)palo_alto

What to do

  1. Check whether you run it. Look for PAN-OS in your asset inventory, including appliances and cloud images. Stack check lists every exploited Palo Alto Networks 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 29 Jun 2020.
  4. Get told next time. Email alerts when CISA adds a CVE for Palo Alto Networks.

Other exploited CVEs in PAN-OS

References

Questions

Is CVE-2020-2021 being exploited?

Yes. CISA added CVE-2020-2021 to the Known Exploited Vulnerabilities catalog on 25 Mar 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2020-2021 used in ransomware attacks?

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

How do I fix CVE-2020-2021?

Apply updates per vendor instructions. Check Palo Alto Networks's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected PAN-OS 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 March 2022 · Palo Alto Networks scorecard · act-now radar.

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