Background exploitation KEV catalog

CVE-2023-20273

Cisco IOS XE Web UI Command Injection Vulnerability

CheckOps priority index

7.5/10 Patch within 7 days

Severity7.2

Probability9.3

Exploitation3/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 92.9% higher than 99.8% of CVEs

CVSS 3.1 7.2 AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:

Exploited for 1,107 days 23 Oct 2023

CISA due date 27 Oct 2023 for US federal agencies

Exploitation probability EPSS · FIRST

EPSS probability (%)Percentile among all CVEs

Exploitation signals 3 / 5

KEV catalog (CISA)23 Oct 2023
Exploited in EUVD (ENISA)23 Oct 2023
Used by ransomwareno
EPSS above 10 %92.9%
No account, over the networkno

What to do

Fix

Apply the vendor’s fix as soon as it is available.

CISA guidance: 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.

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Description ENISA EUVD

A vulnerability in the web UI feature of Cisco IOS XE Software could allow an authenticated, remote attacker to inject commands with the privileges of root. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted input to the web UI. A successful exploit could allow the attacker to inject commands to the underlying operating system with root privileges.

Affected products

Cisco IOS XE SoftwareCisco IOS XE Web UI

Affected versions

17.1.1s
16.1.1
16.9.3a
16.8.1c
17.7.2
17.2.1r
17.9.1w
17.3.7
17.9.3
17.10.1b
16.12.1s
16.10.1b

Weaknesses (CWE)

CWE-78

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

23 Oct 2023
Exploitation reported (ENISA)
23 Oct 2023
Added to the KEV catalog
24 Oct 2023
Published
27 Oct 2023
CISA remediation due date
17 Oct 2026
EPSS peak: 93.0%

References

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