CVE-2026-20182
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Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
rank 91 = 40 + 25 + 7 + 11 + 8
rank@v1 · act now
Someone is already using it
CISA KEV catalog · public proof-of-concept · FIRST EPSS
EPSS 0.91817 · CISA KEV listed · without this subject the record ranks 51
What it costs you if it fires
NVD CVSS base score, then the CNA's own
CVSS 10.0, from the CNA · without this subject the record ranks 66
It is getting worse, not staying still
FIRST EPSS series, rescorings and bad loads removed
rose on 2026-05-21 · without this subject the record ranks 84
How much of the world it touches
NVD CPE configurations
24 products in the CPE ranges · without this subject the record ranks 80
Someone else already set the date
CISA KEV remediation due date
CISA remediation date held · without this subject the record ranks 83
Hindsight · the state
Foresight · where to check next
This record is one instance of CWE-287, improper authentication. The index holds 5176 prior instances of this class, 49 KEV-listed. The nearest of its KEV-listed records are drawn beside this. taxonomy@v1
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Harm, if it fires from the vector and the weakness
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CISA KEV & Federal Remediation Deadline from the record and CISA
The fix, and how long it's been waiting.
Show full CISA required action
Please adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlined 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.
Exploit Status & Known PoCs a ladder, not a score
Current rung: Exploited in the wild · CISA KEV listed, 2026-05-14.
Affected & Fixed Versions as published
Show all 24 published ranges
A rung lights from a row in the index, never from an assessment. "Held sources" is the true scope of the claim: this index reads the CVE record, NVD, CISA KEV, FIRST's EPSS and public proof-of-concept repositories, and it does not observe attacks.
$4.58M = $4.99M incident cost x 1 exposure x 0.91817 likelihood
udv@v1 · unaudited · wrong for you until you say what you run
$4.99M is the cost of a breach that happened, from IBM Cost of a Data Breach Report 2026, global average. It is not the value of any asset of yours. That average already covers breaches of every severity, so scaling it by exposure understates a partial-impact record. That is an assumption, not a measurement. Your own asset value goes in the decision record.
Attack path
What it is stated by the CNA
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, 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 receipt
Read the rest of the CNA's description
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 the 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.
NVD's analysis a second authority
- weakness
- CWE-287
- affected versions
- cisco catalyst sd-wan manager < 20.9.9.1; cisco catalyst sd-wan manager >= 20.10 < 20.12.5.4; cisco catalyst sd-wan manager >= 20.12.6 < 20.12.6.2; and 21 more, listed in full below
- also scored by
- psirt@cisco.com 10 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
check it yourself sec.cloudapps.cisco.com sec.cloudapps.cisco.com receipt
Dated events
Movement the material steps
This score more than doubled inside 72 hours. Both observations are in the full history below.
Show all 17 observations
17 observations held. A highlighted step crossed a promotion threshold. A step marked with a scoring model moved because the instrument was replaced, not because the vulnerability changed. receipt
The full biography
Listed by CISA on the day it published, exploit probability more than doubled between 2026-05-15 and 2026-05-16 (0.01561 → 0.37954) and the record had been public for 4 months when this index was last written.
The pattern, elsewhere
This record is one instance of CWE-287, improper authentication. The index holds 5176 prior instances of this class, 49 KEV-listed. The nearest of its KEV-listed records are drawn beside this. cwe-consequences@4.20
"Matches n of m" counts the attributes the two records can both be compared on: the CVSS metrics they share a version of, any weakness class beyond this one, and the vendor. fit-rules@v1
5176 records in this class held. The six above are drawn from the ones CISA has listed as exploited, ranked by how much of the record matches this one. That is why every one of them is KEV-listed: the pool is, so the colour on those spokes says nothing the pool has not already said.
No curated product neighbourhood is held for this product, so the records above are the nearest this index can name. The neighbourhood table covers a small set of products and is extended by hand.
Siblings and hubs
Records related to this one
None. No alias set, and nothing in the corpus cites this identifier or shares its product family within 60 days.
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What usually comes next
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