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Exploited vulnerability · CISA KEV

Is CVE-2018-0173 exploited? Yes: in CISA KEV since 3 Mar 2022

Gociux · Cisco IOS and IOS XE Software · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2018-0173, Cisco IOS and IOS XE Software Improper Input Validation Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Mar 2022, 1436 days after it was published. It affects Cisco IOS and IOS XE Software, 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 Mar 2022
ransomwareNot knownno confirmed use
EPSStop 10%more likely than most to be exploited
severity8.6CVSS 3.1 · high
US federal due17 Mar 2022BOD 22-01 deadline

What it is

A vulnerability in the Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets can allow for denial-of-service (DoS).

VendorCisco (103 exploited CVEs in KEV)
ProductIOS and IOS XE Software
VulnerabilityCisco IOS and IOS XE Software Improper Input Validation Vulnerability
WeaknessCWE-20
Published28 Mar 2018
Added to KEV3 Mar 2022
Reported by (CNA)cisco

What to do

  1. Check whether you run it. Look for IOS and IOS XE Software in your asset inventory, including appliances and cloud images. Stack check lists every exploited Cisco 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 28 Mar 2018.
  4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

Other exploited CVEs in IOS and IOS XE Software

References

Questions

Is CVE-2018-0173 being exploited?

Yes. CISA added CVE-2018-0173 to the Known Exploited Vulnerabilities catalog on 3 Mar 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2018-0173 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-2018-0173?

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

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