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CVE-2023-20198

Exploitation: active CVSS 10.0 CRITICAL

CVSS base score: 10.0 (Critical) vendor CNA · v3.1

Score assigned by the vendor's own CVE Numbering Authority (CNA); CISA's Vulnrichment program adds a score only when the CNA omits one.

Cisco IOS XE Web UI Privilege Escalation Vulnerability

Vendor: Cisco   Product: IOS XE Web UI

Description

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.

Lifecycle Timeline

Each milestone comes from a different source, so gaps between them are gaps in what those sources publish, not evidence that nothing happened. EPSS history for this CVE holds 165 points from 2023-10-21, tracked daily from 2026-09-09; earlier points are weekly, which dates a spike to within a week. Peak probability 99.6% on 2026-06-20.

Published Applicability

CVE List v5 (CNA container) 186 affected · 0 fixed · 0 not affected

Check whether a specific version is affected →

What each source publishes about which product versions carry this vulnerability, kept as written rather than merged. Absence here means no source has published applicability data, not that nothing is affected.

Research & News Coverage

DateSourceArticle
2026-06-24 Kaspersky Securelist StrikeShark: investigating a new campaign delivering Cobalt Strike through SharkLoader

Articles from monitored vendor research blogs and security news feeds that specifically mention this CVE. Coverage begins when feed monitoring started; earlier articles are not indexed.

Detection & Exploitation

Scan
Exploit / Pen Test
Host / SIEM

Coverage across public collections only: Nuclei and OpenVAS NVT (scan); Snort and Suricata ET Open (network); Sigma and YARA (host/SIEM); Metasploit, Exploit-DB and public GitHub repositories (exploit). Absence here means nothing public was found, not that detection is impossible.
GitHub PoC repositories are collected automatically by PoC-in-GitHub (CC0) and are not vetted: some are fakes and some are malware. Treat them as evidence that code was published, not as code to run.
OpenVAS coverage derives from the Greenbone Community Feed, made available under the Open Database License (ODbL) v1.0; its individual Vulnerability Tests are licensed GNU GPL v2.

CISA Assessment (Vulnrichment / SSVC)

active
yes
total
—
10.0 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE-420 — Unprotected Alternate Channel
2024-10-23

KEV Catalog Status

2023-10-16
2023-10-20
Unknown

Listed By

SourceDateRecord
CISA KEV 2023-10-16 source record →
CISA Vulnrichment 2024-10-23 source record →

Referenced in Advisories

DateAdvisoryIssuer
2025-08-27 Countering Chinese State-Sponsored Actors Compromise of Networks Worldwide to Feed Global Espionage System NSA
2025-08-27 Countering Chinese State-Sponsored Actors Compromise of Networks Worldwide to Feed Global Espionage System NSA
2025-08-27 CSA: Countering China State Actors Compromise of Networks NSA
2025-06-30 People's Republic of China Cyberthreat Activity FBI
2024-11-12 2023 Top Routinely Exploited Vulnerabilities CISA
2024-10-10 Update on SVR Cyber Operations and Vulnerability Exploitation NSA

Weaponization Timeline — Offensive & Testing Tools

No exploit-tool sightings recorded for this CVE.

Evidence tiers are explained on the About page — a merged Metasploit module is far stronger evidence than a distro package mention.

External References