CVE-2026-20127Vulnerability
Cisco Catalyst SD-WAN Controller and Manager Authentication Bypass Vulnerability
Reported by 3 independent sources · first reported by GreyNoise · last reported
Last reported 24 days ago
Fix due 27 Feb 2026
Used by ransomware: not knownCISA KEV catalogue
higher than 99% of CVEsFIRST EPSS, as of 23 Oct 2026
What the reports say
3 reports, newest first · the exact sentence from each-
Critical Cisco Catalyst SD-WAN Manager API authentication bypass exploited in the wild (CVE-2026-76504)“Cisco Catalyst SD-WAN Manager was also affected by two critical, unauthenticated peering authentication flaws earlier in 2026: CVE-2026-20127 and Rapid7-discovered CVE-2026-20182.”
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Zero-Day Exploitation of Vulnerability (CVE-2026-20245) in Cisco Catalyst SD-WAN Manager“CVE-2026-20127 and CVE-2026-20182 are critical vulnerabilities recently disclosed by Cisco that affect the peering authentication mechanism for Cisco Catalyst SD-WAN controllers.”
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The Internet Changes Before the Advisory Drops“Before Cisco published its advisory for CVE-2026-20127 — a CVSS 10.0 zero-day cited in a Five Eyes joint warning — GreyNoise sensors had already observed eight distinct surges of Cisco-targeting activity.”
Indicators reported together
named in the same reports- 20.12.7[.]2in 1 report
- 20.15.4[.]5in 1 report
- 20.15.5[.]3in 1 report
- 20.18.3[.]1in 1 report
- 26.1.1[.]2in 1 report
- 126.51.108[.]152in 1 report
- 76.92.245[.]217in 1 report
- 207.190.37[.]94in 1 report
- 23.245.7[.]178in 1 report
- 153.186.231[.]233in 1 report
- 167.179.79[.]189in 1 report
- 45.32.38[.]160in 1 report
- 209.137.225[.]101in 1 report
- b82936f376485184…e3a108880f7bin 1 report
- 20.9.10[.]1in 1 report
Copy these 15 indicators · defanged
Also named with it: CVE-2026-20182, CVE-2026-20245, CVE-2026-0400, CVE-2026-24858, CVE-2026-76504
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