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CVE-2026-20182

May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and fixed after the was disclosed in February 2026. This new advisory is for a new vulnerability in the control connection handshaking. The section of this advisory includes Show Control Connections guidance to help with system checks.  A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, f
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:bb57ffc01dae0afcd3a15a1c2ab870b768107d1093710e03dc9130f6f7d0fad5
Known exploited
CISA KEV
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"unknown","product":"Cisco Catalyst SD-WAN Controller","vendor":"Cisco","versions":[{"status":"affected","version":"20.6.4"},{"status":"affected","version":"20.9.2"},{"status":"affected","version":"20.3.6"},{"status":"affected","version":"20.7.2"},{"status":"affected","version":"20.7.1"},{"status":"affected","version":"20.5.1"},{"status":"affected","version":"20.6.2"},{"status":"affected","version":"19.3.0"},{"status":"affected","version":"20.6.1"},{"status":"affected","version":"17.2.4"},{"status":"affected","version":"18.2.0"},{"status":"affected","version":"18.4.6"},{"statu…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9dff69ee135f14d4730e0e2ccdefd8dfd8b3beec1f219b8b5e97a72ff887dfae · sha256:0802b8ee54879838… · /containers/cna/affected/0

{"defaultStatus":"unknown","product":"Cisco Catalyst SD-WAN Manager","vendor":"Cisco","versions":[{"status":"affected","version":"20.1.12"},{"status":"affected","version":"19.2.1"},{"status":"affected","version":"18.4.4"},{"status":"affected","version":"18.4.5"},{"status":"affected","version":"20.1.1.1"},{"status":"affected","version":"20.1.1"},{"status":"affected","version":"19.2.099"},{"status":"affected","version":"18.3.6"},{"status":"affected","version":"18.3.7"},{"status":"affected","version":"19.2.0"},{"status":"affected","version":"19.1.0"},{"status":"affected","version":"18.4.303"},{"s…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9dff69ee135f14d4730e0e2ccdefd8dfd8b3beec1f219b8b5e97a72ff887dfae · sha256:0802b8ee54879838… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"defaultStatus":"unknown","product":"Cisco Catalyst SD-WAN Controller","vendor":"Cisco","versions":[{"status":"affected","version":"20.6.4"},{"status":"affected","version":"20.9.2"},{"status":"affected","version":"20.3.6"},{"status":"affected","version":"20.7.2"},{"status":"affected","version":"20.7.1"},{"status":"affected","version":"20.5.1"},{"status":"affected","version":"20.6.2"},{"status":"affected","version":"19.3.0"},{"status":"affected","version":"20.6.1"},{"status":"affected","version":"17.2.4"},{"status":"affected","version":"18.2.0"},{"status":"affected","version":"18.4.6"},{"statu…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9dff69ee135f14d4730e0e2ccdefd8dfd8b3beec1f219b8b5e97a72ff887dfae · sha256:0802b8ee54879838… · /containers/cna/affected/0
{"defaultStatus":"unknown","product":"Cisco Catalyst SD-WAN Manager","vendor":"Cisco","versions":[{"status":"affected","version":"20.1.12"},{"status":"affected","version":"19.2.1"},{"status":"affected","version":"18.4.4"},{"status":"affected","version":"18.4.5"},{"status":"affected","version":"20.1.1.1"},{"status":"affected","version":"20.1.1"},{"status":"affected","version":"19.2.099"},{"status":"affected","version":"18.3.6"},{"status":"affected","version":"18.3.7"},{"status":"affected","version":"19.2.0"},{"status":"affected","version":"19.1.0"},{"status":"affected","version":"18.4.303"},{"s…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9dff69ee135f14d4730e0e2ccdefd8dfd8b3beec1f219b8b5e97a72ff887dfae · sha256:0802b8ee54879838… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":10,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9dff69ee135f14d4730e0e2ccdefd8dfd8b3beec1f219b8b5e97a72ff887dfae · sha256:0802b8ee54879838… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-287","description":"Improper Authentication","lang":"en","type":"cwe"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9dff69ee135f14d4730e0e2ccdefd8dfd8b3beec1f219b8b5e97a72ff887dfae · sha256:0802b8ee54879838… · /containers/cna/problemTypes/0/descriptions/0

Known exploitation assertions

2 source assertions
{"cwes":["CWE-287"],"dateAdded":"2026-05-14","dueDate":"2026-05-17","knownRansomwareCampaignUse":"Unknown","notes":"CISA Mitigation Instructions: https://www.cisa.gov/news-events/directives/ed-26-03-mitigate-vulnerabilities-cisco-sd-wan-systems ; https://www.cisa.gov/news-events/directives/supplemental-direction-ed-26-03-hunt-and-hardening-guidance-cisco-sd-wan-systems ; https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SW ; https://nvd.nist.gov/vuln/detail/CVE-2026-20182","product":"Catalyst SD-WAN","requiredAction":"Please adhere to CISA’…
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:c553e2344fed05a74726324c348ce77e85756c71f5d062222291a15bdf8a030e · sha256:16acee8334e59e44… · /vulnerabilities/66
    Open source location →
{"cwes":["CWE-287"],"dateAdded":"2026-05-14","dueDate":"2026-05-17","knownRansomwareCampaignUse":"Unknown","notes":"CISA Mitigation Instructions: https://www.cisa.gov/news-events/directives/ed-26-03-mitigate-vulnerabilities-cisco-sd-wan-systems ; https://www.cisa.gov/news-events/directives/supplemental-direction-ed-26-03-hunt-and-hardening-guidance-cisco-sd-wan-systems ; https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SW ; https://nvd.nist.gov/vuln/detail/CVE-2026-20182","product":"Catalyst SD-WAN","requiredAction":"Please adhere to CISA’…
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:7697721712f8a637bccdba32bdca1b31ed5d824a546246be27728981bab1a9cc · sha256:635dff916c4092c0… · /vulnerabilities/69
    Open source location →

Source references

3 source assertions
{"name":"Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability</a> was disclosed in February 2026. This new advisory is for a new vulnerability in the control connection handshaking. The <a href=\"#IOC\">Indicators of Compromise","url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9dff69ee135f14d4730e0e2ccdefd8dfd8b3beec1f219b8b5e97a72ff887dfae · sha256:0802b8ee54879838… · /containers/cna/references/1
{"name":"cisco-sa-sdwan-rpa2-v69WY2SW","url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SW"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9dff69ee135f14d4730e0e2ccdefd8dfd8b3beec1f219b8b5e97a72ff887dfae · sha256:0802b8ee54879838… · /containers/cna/references/0
{"tags":["government-resource"],"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20182"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9dff69ee135f14d4730e0e2ccdefd8dfd8b3beec1f219b8b5e97a72ff887dfae · sha256:0802b8ee54879838… · /containers/adp/0/references/0

Attribution and limitations

  • CISA Known Exploited Vulnerabilities JSON: CISA named for provenance; do not use CISA/DHS marks or imply endorsement Source →
  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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