Please adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlines in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s “Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
Evidence dossier
CVE-2026-20127
Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
80.2–95.2Priority evidence range
gen-56ccdaf9Normalized restatement
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.
- State
- PUBLISHED
- Published
- Feb 25, 2026
- Updated
- Jun 16, 2026
- Evidence coverage
- 85%
2026-07-18 · v2026.06.15 · percentile 99.0%
Distinct CVSS assessments remain side by side; none are averaged.
Source comparison
Who said what
ciscooriginal assertion
container
Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
Jul 19, 2026Original evidence ↗
CISA KEVoriginal assertion
observed_exploitation
Cisco Catalyst SD-WAN Controller and Manager Authentication Bypass Vulnerability
Jul 19, 2026Original evidence ↗
FIRST EPSSoriginal assertion
model_probability
Probability 0.577930000000; percentile 0.989810000000
Jul 19, 2026Original evidence ↗
Applicability
Cited product scope
CiscoCisco Catalyst SD-WAN Manager
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"20.12.4_Monthly_ES5"}, {"status": "affected", "version": "20.12.5"}, {"status": "affected", "version": "20.12.5_LI_Images"}, {"status": "affected", "version": "20.9.7_LI _Images"}, {"status": "affected", "version": "20.9.7"}, {"status": "affected", "version": "20.15.3"}, {"status": "affected", "version": "20.15.3_ LI _Images"}, {"status": "affected", "version": "20.12.501"}, {"status": "affected", "version": "20.12.5.1_LI_Images"}, {"status": "affected", "version": "20.12.5.1"}, {"status": "affected", "version": "20.12.5.2_LI_Images"}, {"status": "affected", "version": "20.12.5.2"}, {"status": "affected", "version": "20.15.3.1"}, {"status": "affected", "version": "20.15.4_LI_Images"}, {"status": "affected", "version": "20.15.4"}, {"status": "affected", "version": "20.9.7.1_LI _Images"}, {"status": "affected", "version": "20.9.7.1"}, {"status": "affected", "version": "20.18.1"}, {"status": "affected", "version": "20.18.1_LI_Images"}, {"status": "affected", "version": "20.12.6_LI_Images"}, {"status": "affected", "version": "20.12.6"}, {"status": "affected", "version": "20.12.5.1.01"}, {"status": "affected", "version": "20.9.8"}, {"status": "affected", "version": "20.9.8_LI_Images"}, {"status": "affected", "version": "20.18.2"}, {"status": "affected", "version": "20.15.4.1_LI_Images"}, {"status": "affected", "version": "20.15.4.1"}, {"status": "affected", "version": "20.18.2_LI_Images"}]unknownUnknown vendorUnknown product
cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*; end excluding 20.9.8.2supportedUnknown vendorUnknown product
cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*; start including 20.11; end excluding 20.12.5.3supportedUnknown vendorUnknown product
cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*; start including 20.13; end excluding 20.15.4.2supportedUnknown vendorUnknown product
cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*; start including 20.16; end excluding 20.18.2.1supportedUnknown vendorUnknown product
cpe:2.3:a:cisco:catalyst_sd-wan_manager:20.12.6:*:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:cisco:sd-wan_vbond_orchestrator:*:*:*:*:*:*:*:*; end excluding 20.9.8.2supportedUnknown vendorUnknown product
cpe:2.3:a:cisco:sd-wan_vbond_orchestrator:*:*:*:*:*:*:*:*; start including 20.11; end excluding 20.12.5.3supportedUnknown vendorUnknown product
cpe:2.3:a:cisco:sd-wan_vbond_orchestrator:*:*:*:*:*:*:*:*; start including 20.13; end excluding 20.15.4.2supportedUnknown vendorUnknown product
cpe:2.3:a:cisco:sd-wan_vbond_orchestrator:*:*:*:*:*:*:*:*; start including 20.16; end excluding 20.18.2.1supportedUnknown vendorUnknown product
cpe:2.3:a:cisco:sd-wan_vbond_orchestrator:20.12.6:*:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*; end excluding 20.9.8.2supportedUnknown vendorUnknown product
cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*; start including 20.11; end excluding 20.12.5.3supportedUnknown vendorUnknown product
cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*; start including 20.13; end excluding 20.15.4.2supportedUnknown vendorUnknown product
cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*; start including 20.16; end excluding 20.18.2.1supportedUnknown vendorUnknown product
cpe:2.3:a:cisco:sd-wan_vsmart_controller:20.12.6:*:*:*:*:*:*:*supportedAssessments
CVSS by origin
nvd@nist.govCVSS 3.1 · role Primary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:Hpsirt@cisco.comCVSS 3.1 · role Secondary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HciscoCVSS 3.1 · role unknown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HLimitations and unknowns
- KEV membership is authoritative for the catalog, not proof of exposure in any environment.
- EPSS is a dated model probability and not an individual-environment prediction.
- Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
- NVD-carried upstream facts remain derivative and are not independent corroboration.
- Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
- NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
- Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
- Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.