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Exploited vulnerability · CISA KEV

Is CVE-2020-29583 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Zyxel Multiple Products · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2020-29583, Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 316 days after it was published. It affects Zyxel Multiple Products, 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 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due3 May 2022BOD 22-01 deadline

What it is

Zyxel firewalls (ATP, USG, VM) and AP Controllers (NXC2500 and NXC5500) contain a use of hard-coded credentials vulnerability in an undocumented account ("zyfwp") with an unchangeable password.

VendorZyxel (13 exploited CVEs in KEV)
ProductMultiple Products
VulnerabilityZyxel Multiple Products Use of Hard-Coded Credentials Vulnerability
WeaknessCWE-522
Published22 Dec 2020
Added to KEV3 Nov 2021
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Multiple Products in your asset inventory, including appliances and cloud images. Stack check lists every exploited Zyxel 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 22 Dec 2020.
  4. Get told next time. Email alerts when CISA adds a CVE for Zyxel.

References

Questions

Is CVE-2020-29583 being exploited?

Yes. CISA added CVE-2020-29583 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2020-29583 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-2020-29583?

Apply updates per vendor instructions. Check Zyxel's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Multiple Products 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 · Zyxel scorecard · act-now radar.

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