CVE-2023-20198

critical · 10Actively exploited

On the CISA Known Exploited Vulnerabilities catalog

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.

Added 2023-10-16Remediation due 2023-10-20

A public exploit / detection template exists

Weaponised detection is publicly available, which meaningfully raises real-world risk regardless of CVSS. nuclei-templates →

Cisco is providing an update for the ongoing investigation into observed exploitation of the web UI feature in Cisco IOS XE Software. We are updating the list of fixed releases and adding the Software Checker. Our investigation has determined that the actors exploited two previously unknown issues. The attacker first exploited CVE-2023-20198 to gain initial access and issued a privilege 15 command to create a local user and password combination. This allowed the user to log in with normal user access. The attacker then exploited another component of the web UI feature, leveraging the new local user to elevate privilege to root and write the implant to the file system. Cisco has assigned CVE-2023-20273 to this issue. CVE-2023-20198 has been assigned a CVSS Score of 10.0. CVE-2023-20273 has been assigned a CVSS Score of 7.2. Both of these CVEs are being tracked by CSCwh87343.

CVSS

99.6%

EPSS (exploit prob.)

100th

EPSS percentile

2023-10-16

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weaknesses

CWE-420

Affected products

Vendor	Product	Affected versions
rockwellautomation	allen-bradley_stratix_5200_firmware	< 17.12.02
rockwellautomation	allen-bradley_stratix_5200	all versions
rockwellautomation	allen-bradley_stratix_5800_firmware	< 17.12.02
rockwellautomation	allen-bradley_stratix_5800	all versions
cisco	ios_xe	>= 16.12, < 16.12.10a
cisco	ios_xe	>= 17.3, < 17.3.8a
cisco	ios_xe	>= 17.6, < 17.6.6a
cisco	ios_xe	>= 17.9, < 17.9.4a

Check a specific version with /api/v1/cve/match.

References

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2023-20198