Vulnerabilities

HighKEV

CVE-2026-20128 — Cisco Catalyst SD-WAN Manager Information Disclosure Vulnerability

In brief

Severity · CVSS: High7.5CVSS 3.1, High
EPSS: 7%
CISA KEV: Known exploited, listed since 20 Apr 2026
CERT-FR: CERTFR-2026-AVI-0210
Vendor: Cisco
Published · Modified: 25 Feb 2026 · 17 Jun 2026
Last verified: 1 Oct 2026 at 09:32 UTC

Summary

A vulnerability in the Data Collection Agent (DCA) feature of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to gain DCA user privileges on an affected system. This vulnerability is due to the presence of a credential file for the DCA user on an affected system. An attacker could exploit this vulnerability by sending a crafted HTTP request and reading the file that contains the DCA password from that affected system. A successful exploit could allow the attacker to access another affected system and gain DCA user privileges. Note: Cisco Catalyst SD-WAN Manager releases 20.18 and later are not affected by this vulnerability.

Weakness: CWE-257

Title, description and the vendor's statements are quoted from the CVE record; a vendor's advisory is summarised in Patcharo's words, with a link.

Affected and fixed versions

Per product and release branch, as the vendor's CVE record and official advisory state them. A fixed release is shown only when a document names it: the vendor's, or CERT-FR's for Check Point, with its source.

4 branches with a published fixed release · 19 branches to migrate · 1 branch without a precise fixed release

Cisco Catalyst SD-WAN Manager

Source: CVE-2026-20128cisco-sa-sdwan-authbp-qwCX8D4v

26.1
Affected versions26.1.1
First fixed releaseNot published in the sources followed
20.18
Affected versions< 20.18.2.1
First fixed release20.18.2.1
20.16
Affected versionsListed as affected, releases not specified
First fixed releaseMigration to a fixed release requiredTarget: 20.18.2.1 or later
20.15
Affected versions< 20.15.4.2
First fixed release20.15.4.2
20.14
Affected versionsListed as affected, releases not specified
First fixed releaseMigration to a fixed release requiredTarget: 20.15.4.2 or later
20.13
Affected versionsListed as affected, releases not specified
First fixed releaseMigration to a fixed release requiredTarget: 20.15.4.2 or later
20.12
Affected versions20.12.501
First fixed release20.12.5.320.12.6.1
20.11
Affected versionsListed as affected, releases not specified
First fixed releaseMigration to a fixed release requiredTarget: 20.12.6.1 or later
20.10
Affected versionsListed as affected, releases not specified
First fixed releaseMigration to a fixed release requiredTarget: 20.12.6.1 or later
20.9
Affected versionsListed as affected, releases not specified
First fixed release20.9.8.2
20.7
Affected versionsListed as affected, releases not specified
First fixed releaseMigration to a fixed release required
20.6
Affected versions20.6.0.18.3, 20.6.0.18.4, 20.6.1.0.1, 20.6.1.1
13 releases listed
20.6.0.18.3, 20.6.0.18.4, 20.6.1.0.1, 20.6.1.1, 20.6.1.2, 20.6.2.0.4, 20.6.2.1, 20.6.2.2, 20.6.2.2.3, 20.6.2.2.4, 20.6.2.2.7, 20.6.3.0.2, 20.6.5.1.4
First fixed releaseMigration to a fixed release required
20.5
Affected versions20.5.0.1.1, 20.5.1, 20.5.1.0.1, 20.5.1.0.2
5 releases listed
20.5.0.1.1, 20.5.1, 20.5.1.0.1, 20.5.1.0.2, 20.5.1.2
First fixed releaseMigration to a fixed release required
20.4
Affected versions20.4.1.0.1, 20.4.1.0.2, 20.4.1.1, 20.4.1.1.5
14 releases listed
20.4.1.0.1, 20.4.1.0.2, 20.4.1.1, 20.4.1.1.5, 20.4.1.2, 20.4.2, 20.4.2.0.2, 20.4.2.1, 20.4.2.1.1, 20.4.2.2, 20.4.2.2.1, 20.4.2.2.2, 20.4.2.2.4, 20.4.2.3
First fixed releaseMigration to a fixed release required
20.3
Affected versions20.3.1, 20.3.2, 20.3.2.0.5, 20.3.2.0.6
43 releases listed
20.3.1, 20.3.2, 20.3.2.0.5, 20.3.2.0.6, 20.3.2.1, 20.3.3, 20.3.3.0.2, 20.3.3.0.4, 20.3.3.0.8, 20.3.3.0.14, 20.3.3.0.16, 20.3.3.0.18, 20.3.3.1.1, 20.3.3.1.2, 20.3.3.1.5, 20.3.3.1.7, 20.3.3.1.10, 20.3.3.2, 20.3.4, 20.3.4.0.1, 20.3.4.0.6, 20.3.4.0.9, 20.3.4.0.11, 20.3.4.0.19, 20.3.4.0.20, 20.3.4.0.24, 20.3.4.0.25, 20.3.4.1, 20.3.4.1.1, 20.3.4.1.2, 20.3.4.2.1, 20.3.4.2.2, 20.3.4.3, 20.3.5.0.7, 20.3.5.0.8, 20.3.5.0.9, 20.3.5.1, 20.3.6, 20.3.7, 20.3.7.1, 20.3.8, 20.3.813, 20.3.814
First fixed releaseMigration to a fixed release required
20.1
Affected versions20.1.1, 20.1.1.1, 20.1.2, 20.1.3
6 releases listed
20.1.1, 20.1.1.1, 20.1.2, 20.1.3, 20.1.3.1, 20.1.12
First fixed releaseMigration to a fixed release required
19.3
Affected versions19.3
First fixed releaseMigration to a fixed release required
19.2
Affected versions19.2, 19.2.1, 19.2.2, 19.2.3
14 releases listed
19.2, 19.2.1, 19.2.2, 19.2.3, 19.2.4, 19.2.4.0.1, 19.2.4.0.8, 19.2.4.0.9, 19.2.31, 19.2.32, 19.2.97, 19.2.98, 19.2.99, 19.2.929
First fixed releaseMigration to a fixed release required
19.1
Affected versions19.1
First fixed releaseMigration to a fixed release required
19.0
Affected versions19.0, 19.0.1a
First fixed releaseMigration to a fixed release required
18.4
Affected versions18.4, 18.4.0.1, 18.4.1, 18.4.3
9 releases listed
18.4, 18.4.0.1, 18.4.1, 18.4.3, 18.4.4, 18.4.5, 18.4.6, 18.4.302, 18.4.303
First fixed releaseMigration to a fixed release required
18.3
Affected versions18.3, 18.3.1, 18.3.1.1, 18.3.3
11 releases listed
18.3, 18.3.1, 18.3.1.1, 18.3.3, 18.3.3.1, 18.3.4, 18.3.5, 18.3.6, 18.3.6.1, 18.3.7, 18.3.8
First fixed releaseMigration to a fixed release required
18.2
Affected versions18.2
First fixed releaseMigration to a fixed release required
17.2
Affected versions17.2.5, 17.2.6, 17.2.7, 17.2.8
6 releases listed
17.2.5, 17.2.6, 17.2.7, 17.2.8, 17.2.9, 17.2.10
First fixed releaseMigration to a fixed release required

Remediation

Fix available

Vendor fix

Catalyst SD-WAN Manager 20.1820.18.2.1
Catalyst SD-WAN Manager 20.1520.15.4.2
Catalyst SD-WAN Manager 20.1220.12.5.3, 20.12.6.1
Catalyst SD-WAN Manager 20.920.9.8.2

Upgrade to a fixed release listed above for your branch, or to a later fixed release the vendor explicitly supports.

Branches without a fix of their own: migrate to a fixed release

Catalyst SD-WAN Manager 20.16 → 20.18.2.1
Catalyst SD-WAN Manager 20.14 → 20.15.4.2
Catalyst SD-WAN Manager 20.13 → 20.15.4.2
Catalyst SD-WAN Manager 20.11 → 20.12.6.1
Catalyst SD-WAN Manager 20.10 → 20.12.6.1
Catalyst SD-WAN Manager 20.7
Catalyst SD-WAN Manager 20.6
Catalyst SD-WAN Manager 20.5
Catalyst SD-WAN Manager 20.4
Catalyst SD-WAN Manager 20.3
Catalyst SD-WAN Manager 20.1
Catalyst SD-WAN Manager 19.3
Catalyst SD-WAN Manager 19.2
Catalyst SD-WAN Manager 19.1
Catalyst SD-WAN Manager 19.0
Catalyst SD-WAN Manager 18.4
Catalyst SD-WAN Manager 18.3
Catalyst SD-WAN Manager 18.2
Catalyst SD-WAN Manager 17.2

Cisco has released updates that fix this vulnerability; its advisory lists them.

SourceCisco Security Advisory cisco-sa-sdwan-authbp-qwCX8D4v

Workarounds (vendor)

Cisco states in its advisory that no workaround is available.

SourceCisco Security Advisory cisco-sa-sdwan-authbp-qwCX8D4v

CISA KEV required action

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.

CISA due date: 23 Apr 2026

SourceCISA KEV

CERT-FR recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

SourceCERTFR-2026-AVI-0210

Last verified 1 Oct 2026 at 09:32 UTC

Known exploitation

Added to CISA KEV on 20 Apr 2026

Federal remediation due date: 23 Apr 2026

The CISA required action is shown under Remediation.

7% probability of exploitation in the next 30 days (percentile 94%).

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

CERT-FR

1 document of the French national CERT (ANSSI) references this CVE.

Advisory (AVI)CERTFR-2026-AVI-0210Published 25 Feb 2026

Multiple vulnerabilities in Cisco Catalyst SD-WAN

Remote arbitrary code executionData integrity breachSecurity policy bypassData confidentiality breachPrivilege escalation

Summary

Multiple vulnerabilities have been discovered in Cisco Catalyst SD-WAN. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation, and a data confidentiality breach. Cisco indicates that the vulnerability CVE-2026-20127 is actively exploited.

Recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

Official document on cert.ssi.gouv.frread by Patcharo 28 Sept 2026 at 20:04 UTCMachine translation of the French text published by CERT-FR; a text whose translation did not pass Patcharo's checks stays in French. Identifiers, versions and links are copied unchanged.

Timeline

25 Feb 2026Published by the source
20 Apr 2026Added to CISA KEV
23 Apr 2026CISA remediation due date
17 Jun 2026Source record last modified
29 Sept 2026EPSS score computed
1 Oct 2026Last verified by Patcharo

Official sources

Cisco (CVE record)retrieved 1 Oct 2026 at 09:32 UTC
CISA Known Exploited Vulnerabilitiesretrieved 1 Oct 2026 at 09:28 UTC
NVDretrieved 27 Sept 2026 at 23:44 UTC
FIRST EPSSretrieved 30 Sept 2026 at 00:17 UTC
Cisco Security Advisory cisco-sa-sdwan-authbp-qwCX8D4vretrieved 1 Oct 2026 at 09:32 UTC

References

Cisco · CISA Known Exploited Vulnerabilities · NVD · FIRST EPSS · Cisco Security Advisory cisco-sa-sdwan-authbp-qwCX8D4v

How Patcharo reads this

Affected and fixed releases come from the vendor's structured statements and are matched against exact versions; CVSS from NVD, exploitation from CISA KEV and the vendor's own advisory, probability from FIRST EPSS. Missing data stays Unknown and never becomes Not affected.

Read the methodology Read the guide: Cisco Secure Firewall release trains: Threat Defense, Management Center and ASA versions explained