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Exploited vulnerability · CISA KEV

Is CVE-2023-20198 exploited? Yes: in CISA KEV since 16 Oct 2023

Gociux · Cisco IOS XE Web UI · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2023-20198, Cisco IOS XE Web UI Privilege Escalation Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 16 Oct 2023, the day it was published. It affects Cisco IOS XE Web UI, an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Verify that instances of Cisco IOS XE Web UI are in compliance with BOD 23-02 and apply mitigations per vendor instructions. For affected products (Cisco IOS XE Web UI exposed to the internet or to untrusted networks), follow vendor instructions to determine if a system may have been compromised and immediately report positive findings to CISA.

exploitedYesCISA KEV · 16 Oct 2023
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity10CVSS 3.1 · critical
US federal due20 Oct 2023BOD 22-01 deadline

What it is

Cisco IOS XE Web UI contains a privilege escalation vulnerability in the web user interface that could allow a remote, unauthenticated attacker to create an account with privilege level 15 access. The attacker can then use that account to gain control of the affected device.

VendorCisco (103 exploited CVEs in KEV)
ProductIOS XE Web UI
VulnerabilityCisco IOS XE Web UI Privilege Escalation Vulnerability
WeaknessCWE-420
Published16 Oct 2023
Added to KEV16 Oct 2023
Reported by (CNA)cisco

What to do

  1. Check whether you run it. Look for IOS XE Web UI in your asset inventory, including appliances and cloud images. Stack check lists every exploited Cisco CVE at once.
  2. Apply the fix. Verify that instances of Cisco IOS XE Web UI are in compliance with BOD 23-02 and apply mitigations per vendor instructions. For affected products (Cisco IOS XE Web UI exposed to the internet or to untrusted networks), follow vendor instructions to determine if a system may have been compromised and immediately report positive findings to CISA.
  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 16 Oct 2023.
  4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

References

Questions

Is CVE-2023-20198 being exploited?

Yes. CISA added CVE-2023-20198 to the Known Exploited Vulnerabilities catalog on 16 Oct 2023, which means there is reliable evidence of exploitation in the wild.

Is CVE-2023-20198 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-2023-20198?

Verify that instances of Cisco IOS XE Web UI are in compliance with BOD 23-02 and apply mitigations per vendor instructions. For affected products (Cisco IOS XE Web UI exposed to the internet or to untrusted networks), follow vendor instructions to determine if a system may have been compromised and immediately report positive findings to CISA. Check Cisco's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected IOS XE Web UI 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 October 2023 · Cisco scorecard · act-now radar.

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