CVE-2026-20127

CRITICALNVD 10.010.0—
EchelonGraph scoreHIGH confidence

Score elevated to 10.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-02-25), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 10.0 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
10.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 88%CVSS: 10.0Exploit: cisa kev · Metasploit · epss top5pct · epss high · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
10.0
EG Score
10.0(high)
EG Risk
90(Attend)
EG Risk 90/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity100% × 45%
Exploitation100% × 40%
Automatability30% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
88%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

February 25, 2026

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Aug 27, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20127
generic

Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk

Vendor Advisories for CVE-2026-20127(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 49× in last 7d / 206× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 514 total refreshes for this CVE.

  1. 2026-08-30 07:26 UTCGHSA enrichment
  2. 2026-08-30 03:17 UTCGHSA enrichment
  3. 2026-08-29 23:07 UTCGHSA enrichment
  4. 2026-08-29 18:57 UTCGHSA enrichment
  5. 2026-08-29 14:46 UTCGHSA enrichment
  6. 2026-08-29 10:36 UTCGHSA enrichment
  7. 2026-08-29 06:26 UTCGHSA enrichment
  8. 2026-08-29 02:17 UTCGHSA enrichment
  9. 2026-08-28 22:04 UTCEG score recompute
  10. 2026-08-28 22:04 UTCGHSA enrichment
  11. 2026-08-28 21:41 UTCEPSS rescore
  12. 2026-08-28 17:49 UTCGHSA enrichment
  13. 2026-08-28 13:37 UTCGHSA enrichment
  14. 2026-08-28 09:26 UTCGHSA enrichment
  15. 2026-08-28 05:13 UTCGHSA enrichment
  16. 2026-08-28 01:04 UTCGHSA enrichment
  17. 2026-08-27 20:52 UTCGHSA enrichment
  18. 2026-08-27 17:22 UTCCISA KEV update
  19. 2026-08-27 16:41 UTCGHSA enrichment
  20. 2026-08-27 12:31 UTCGHSA enrichment
  21. 2026-08-27 08:21 UTCGHSA enrichment
  22. 2026-08-27 04:11 UTCGHSA enrichment
  23. 2026-08-27 00:02 UTCGHSA enrichment
  24. 2026-08-26 19:52 UTCGHSA enrichment
  25. 2026-08-26 17:41 UTCCISA KEV update
Show 75 more
  1. 2026-08-26 15:43 UTCEG score recompute
  2. 2026-08-26 15:43 UTCGHSA enrichment
  3. 2026-08-26 14:46 UTCEPSS rescore
  4. 2026-08-26 11:33 UTCGHSA enrichment
  5. 2026-08-26 07:22 UTCGHSA enrichment
  6. 2026-08-26 03:12 UTCGHSA enrichment
  7. 2026-08-25 23:02 UTCGHSA enrichment
  8. 2026-08-25 18:52 UTCGHSA enrichment
  9. 2026-08-25 14:42 UTCGHSA enrichment
  10. 2026-08-25 10:32 UTCGHSA enrichment
  11. 2026-08-25 06:22 UTCGHSA enrichment
  12. 2026-08-25 02:11 UTCGHSA enrichment
  13. 2026-08-24 22:01 UTCGHSA enrichment
  14. 2026-08-24 18:52 UTCCISA KEV update
  15. 2026-08-24 17:51 UTCEG score recompute
  16. 2026-08-24 17:51 UTCGHSA enrichment
  17. 2026-08-24 13:42 UTCGHSA enrichment
  18. 2026-08-24 09:32 UTCEG score recompute
  19. 2026-08-24 09:32 UTCGHSA enrichment
  20. 2026-08-24 05:22 UTCGHSA enrichment
  21. 2026-08-24 01:12 UTCGHSA enrichment
  22. 2026-08-23 21:02 UTCGHSA enrichment
  23. 2026-08-23 16:52 UTCGHSA enrichment
  24. 2026-08-23 12:42 UTCGHSA enrichment
  25. 2026-08-23 08:33 UTCGHSA enrichment
  26. 2026-08-23 04:23 UTCGHSA enrichment
  27. 2026-08-23 00:14 UTCGHSA enrichment
  28. 2026-08-22 20:04 UTCGHSA enrichment
  29. 2026-08-22 15:54 UTCGHSA enrichment
  30. 2026-08-22 11:44 UTCGHSA enrichment
  31. 2026-08-22 07:34 UTCGHSA enrichment
  32. 2026-08-22 03:24 UTCGHSA enrichment
  33. 2026-08-21 23:14 UTCGHSA enrichment
  34. 2026-08-21 19:04 UTCGHSA enrichment
  35. 2026-08-21 16:49 UTCCISA KEV update
  36. 2026-08-21 14:54 UTCGHSA enrichment
  37. 2026-08-21 10:44 UTCGHSA enrichment
  38. 2026-08-21 06:35 UTCGHSA enrichment
  39. 2026-08-21 02:25 UTCEG score recompute
  40. 2026-08-21 02:24 UTCGHSA enrichment
  41. 2026-08-20 22:55 UTCEPSS rescore
  42. 2026-08-20 22:15 UTCGHSA enrichment
  43. 2026-08-20 18:05 UTCGHSA enrichment
  44. 2026-08-20 17:06 UTCCISA KEV update
  45. 2026-08-20 13:55 UTCGHSA enrichment
  46. 2026-08-20 09:45 UTCGHSA enrichment
  47. 2026-08-20 05:35 UTCGHSA enrichment
  48. 2026-08-20 01:26 UTCGHSA enrichment
  49. 2026-08-19 21:16 UTCGHSA enrichment
  50. 2026-08-19 17:33 UTCCISA KEV update
  51. 2026-08-19 17:06 UTCEG score recompute
  52. 2026-08-19 17:06 UTCGHSA enrichment
  53. 2026-08-19 17:03 UTCEPSS rescore
  54. 2026-08-19 12:56 UTCGHSA enrichment
  55. 2026-08-19 08:47 UTCGHSA enrichment
  56. 2026-08-19 04:36 UTCGHSA enrichment
  57. 2026-08-19 00:26 UTCGHSA enrichment
  58. 2026-08-18 20:14 UTCGHSA enrichment
  59. 2026-08-18 16:58 UTCCISA KEV update
  60. 2026-08-18 16:03 UTCEG score recompute
  61. 2026-08-18 16:03 UTCGHSA enrichment
  62. 2026-08-18 13:48 UTCEPSS rescore
  63. 2026-08-18 11:52 UTCGHSA enrichment
  64. 2026-08-18 07:41 UTCGHSA enrichment
  65. 2026-08-18 03:31 UTCGHSA enrichment
  66. 2026-08-17 23:22 UTCGHSA enrichment
  67. 2026-08-17 19:12 UTCGHSA enrichment
  68. 2026-08-17 15:02 UTCGHSA enrichment
  69. 2026-08-17 13:56 UTCCISA KEV update
  70. 2026-08-17 10:52 UTCGHSA enrichment
  71. 2026-08-17 06:43 UTCGHSA enrichment
  72. 2026-08-17 02:34 UTCGHSA enrichment
  73. 2026-08-16 22:24 UTCGHSA enrichment
  74. 2026-08-16 18:14 UTCGHSA enrichment
  75. 2026-08-16 14:04 UTCGHSA enrichment

Publicly available exploits

(6 references)

Working exploit code is in the public domain (1 Metasploit module) (5 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCgigachadusers/cve-2026-20127
    First seen Apr 15, 2026
    Open source ↗
  • GitHub PoCsfewer-r7/CVE-2026-20127
    First seen Mar 9, 2026

    An exploit for the Cisco Catalyst SD-WAN Controller authentication bypass vulnerability, CVE-2026-20127

    Open source ↗
  • GitHub PoCyonathanpy/CVE-2026-20127-Cisco-SD-WAN-Preauth-RCE
    First seen Mar 7, 2026
    Open source ↗
  • GitHub PoCBugFor-Pings/CVE-2026-20127_EXP
    First seen Mar 5, 2026

    Cisco Catalyst SD-WAN 身份验证绕过漏洞(CVE-2026-20127)利用EXP

    Open source ↗
  • GitHub PoCzerozenxlabs/CVE-2026-20127---Cisco-SD-WAN-Preauth-RCE
    First seen Mar 4, 2026
    Open source ↗
  • Metasploitauxiliary/admin/networking/cisco_sdwan_auth_bypass✓ verified
    First seen Feb 25, 2026

    Cisco Catalyst SD-WAN Controller Authentication Bypass

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2026-20127?
CVE-2026-20127 is a critical vulnerability published on February 25, 2026. 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…
When was CVE-2026-20127 disclosed?
CVE-2026-20127 was first published in the National Vulnerability Database on February 25, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20127 actively exploited?
Yes. CISA added CVE-2026-20127 to the Known Exploited Vulnerabilities catalog on February 25, 2026, affecting Cisco Catalyst SD-WAN Controller and Manager. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-20127?
CVE-2026-20127 has a CVSS v3 base score of 10.0 (NVD).
Which products are affected by CVE-2026-20127?
CVE-2026-20127 affects Cisco Catalyst SD-WAN Controller and Manager. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-20127?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20127, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-20127

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