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Page generated: 08 Nov 2026, 11:59 UTC
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CVE-2026-20127

A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, and Cisco Catalyst SD-WAN Validator, formerly SD-WAN vBond, could allow an unauthenticated, remote attacker to bypass…

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A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, and Cisco Catalyst SD-WAN Validator, formerly SD-WAN vBond, could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system. This vulnerability exists because the peering authentication mechanism in an affected system is not working properly. An attacker could exploit this vulnerability by sending crafted requests to an affected system. A successful exploit could allow the attacker to log in to an affected Cisco Catalyst SD-WAN Controller as an internal, high-privileged, non-root user account. Using this account, the attacker could access NETCONF, which would then allow the attacker to manipulate network configuration for the SD-WAN fabric. 
CVSS 10.0 (CRITICAL) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
2.9/10
REALITY · THREAT PRIORITY
8.9/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 10: +1.50
  • Fresh EPSS: 87.62%: +0.44

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 35 documents and public datasets.

Hype components

Headline sample (25%)
30/100
Press, 30 days (60%)
35/100
Grounded branding (15%)
0/100
HYPE TOTAL28/100

Sources and documents

NeoTeo
Press · 31 Oct 2026, 18:37 · CVE-2026-20127: KeyDrift targeted Cisco SD-WAN - NeoTeo
BleepingComputer
Press · 29 Oct 2026, 18:38 · Hackers exploit Cisco SD-WAN flaw to deploy custom KeyDrift malware
The Hacker News
Press · 29 Oct 2026, 08:24 · Hackers Exploited Cisco SD-WAN Flaw to Plant Malware Built to Steal Encryption Keys - The Hacker News
Cisco Security Advisory
Technical advisory · 28 Oct 2026, 21:54 · Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
Cisco Security Advisory
Press · 28 Oct 2026, 21:54 · Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
See all 35 source documents
Cisco Talos Blog
Press · 28 Oct 2026, 21:34 · Inside KeyDrift: Analyzing historical UAT-11473 activity on Cisco SD-WAN - Cisco Talos Blog
Cisco Talos Blog
Press · 28 Oct 2026, 21:32 · Inside KeyDrift: Analyzing historical UAT-11473 activity on Cisco SD-WAN
Cisco Talos Blog
Press · 28 Oct 2026, 21:32 · Inside KeyDrift: Analyzing historical UAT-11473 activity on Cisco SD-WAN
The Hacker News
Press · 28 Oct 2026, 18:08 · Volt Typhoon Used Covert Silent Train Network in Four Zero-Day Exploitation Campaigns - The Hacker News
Rescana
Press · 25 Jun 2026, 07:00 · Active Exploitation Alert: Cisco Catalyst SD-WAN Zero-Day (CVE-2026-20245) Enables Root Access via Authenticated File Upload Exploit - Rescana
Rescana
Press · 25 Jun 2026, 07:00 · Cisco Catalyst SD-WAN Zero-Day CVE-2026-20245 Actively Exploited for Root Access and Management Plane Compromise - Rescana
The Hacker News
Press · 25 Jun 2026, 07:00 · Cisco Catalyst SD-WAN Zero-Day CVE-2026-20245 Exploited to Gain Root Access - The Hacker News
Threat Intelligence
Press · 24 Jun 2026, 11:00 · Zero-Day Exploitation of Vulnerability (CVE-2026-20245) in Cisco Catalyst SD-WAN Manager
Google Cloud
Press · 24 Jun 2026, 07:00 · Zero-Day Exploitation of Vulnerability (CVE-2026-20245) in Cisco Catalyst SD-WAN Manager - Google Cloud
The Register
Press · 17 Jun 2026, 07:00 · Cisco adds another SD-WAN box to max-severity bug advisory - The Register
Cybersecurity Dive
Press · 10 Jun 2026, 07:00 · CISA, researchers warn of escalating attacks using Cisco Catalyst SD-WAN flaws - Cybersecurity Dive
Rescana
Press · 07 Jun 2026, 07:00 · Active Exploitation Alert: Cisco Catalyst SD-WAN Manager CVE-2026-20245 Zero-Day Under Attack With No Patch Available - Rescana
The Hacker News
Press · 06 Jun 2026, 07:00 · Cisco Catalyst SD-WAN Manager CVE-2026-20245 Flaw Actively Exploited - The Hacker News
Help Net Security
Press · 05 Jun 2026, 07:00 · Cisco SD-WAN 0-day exploited, no patch available (CVE-2026-20245) - Help Net Security
The Hacker News
Press · 15 May 2026, 07:00 · CISA Adds Cisco SD-WAN CVE-2026-20182 to KEV After Admin Access Exploits - The Hacker News
The Hacker News
Press · 14 May 2026, 07:00 · Cisco Catalyst SD-WAN Controller Auth Bypass Actively Exploited to Gain Admin Access - The Hacker News
Cisco Talos Blog
Press · 14 May 2026, 07:00 · Ongoing exploitation of Cisco Catalyst SD-WAN vulnerabilities - Cisco Talos Blog
Rapid7
Press · 14 May 2026, 07:00 · CVE-2026-20182: Critical authentication bypass in Cisco Catalyst SD-WAN Controller (FIXED) - Rapid7
Cybersecurity Dive
Press · 17 Mar 2026, 07:00 · Security teams might be overlooking wider threat to Cisco SD-WAN - Cybersecurity Dive
The Hacker News
Press · 05 Mar 2026, 08:00 · Cisco Confirms Active Exploitation of Two Catalyst SD-WAN Manager Vulnerabilities - The Hacker News
Arctic Wolf
Press · 27 Feb 2026, 08:00 · Recommendation for CVE-2026-20127 - Arctic Wolf
SOC Prime
Press · 26 Feb 2026, 08:00 · CVE-2026-20127: Cisco SD-WAN Zero-Day Exploited Since 2023 - SOC Prime
The Hacker News
Press · 26 Feb 2026, 08:00 · Cisco SD-WAN Zero-Day CVE-2026-20127 Exploited Since 2023 for Admin Access - The Hacker News
Cisco Talos Blog
Press · 25 Feb 2026, 08:00 · Active exploitation of Cisco Catalyst SD-WAN by UAT-8616 - Cisco Talos Blog
Help Net Security
Press · 25 Feb 2026, 08:00 · Threat actor leveraged Cisco SD-WAN zero-day since 2023 (CVE-2026-20127) - Help Net Security
Rapid7
Press · 25 Feb 2026, 08:00 · Critical Cisco Catalyst Vulnerability Exploited in the wild (CVE-2026-20127) - Rapid7
BleepingComputer
Press · 25 Feb 2026, 08:00 · Critical Cisco SD-WAN bug exploited in zero-day attacks since 2023 - BleepingComputer
CISA (.gov)
Press · 25 Feb 2026, 08:00 · Supplemental Direction ED 26-03: Hunt and Hardening Guidance for Cisco SD-WAN Systems - CISA (.gov)
CERT-FR
Technical advisory · 25 Feb 2026, 00:00 · [MàJ] Vulnérabilité dans Cisco Catalyst SD-WAN (25 février 2026)
CERT-FR
Press · 25 Feb 2026, 00:00 · [MàJ] Vulnérabilité dans Cisco Catalyst SD-WAN (25 février 2026)

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

024681002 Nov 2026 · OBSERVED EXPLOITATION + LOWER RECENT ATTENTIONHype 3.0Reality 8.902 Nov 2026 · OBSERVED EXPLOITATION + LOWER RECENT ATTENTIONHype 3.4Reality 8.902 Nov 2026 · OBSERVED EXPLOITATION + LOWER RECENT ATTENTIONHype 2.9Reality 8.9Nov 2Nov 2Nov 2

━ Hype Score (Perceived)  ━ Reality threat priority. Definition changes are not new attacks.

Public exploit evidence

0

Public exploit entries / repo candidates

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 10; EPSS 87.6%
Attention, last 30 days
7 distinct story titles; 8 press documents; 4 publisher domains.
Technical potential
network access, no prior privileges, no user interaction.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 14:00:00.097835+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Added to the CISA KEV catalog
25 Feb 2026, 00:00
First press mention
25 Feb 2026, 00:00
Published
25 Feb 2026, 16:14
Latest press mention
31 Oct 2026, 18:37
Score calculated
05 Nov 2026, 14:00
Source: CVE List V5 · CISA KEV · FIRST EPSS · GitHub · RSSVulnRadar