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Vulnerabilities

MediumKEV

CVE-2026-20262 — Cisco Catalyst SD-WAN Manager Arbitrary File Write Vulnerability

CVE-2026-20262 · Cisco Catalyst SD-WAN Manager · CVSS 6.5 · KEV

In brief

Severity · CVSS
Medium6.5CVSS 3.1, Medium
EPSS
28%
CISA KEV
Known exploited, listed since 15 Jun 2026
Vendor
Cisco
Published · Modified
·
Last verified

Summary

A vulnerability in the web UI of Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an authenticated, remote attacker to create a file or overwrite any file on the filesystem of an affected system. This vulnerability exists because the affected software does not properly validate user-supplied input during a file upload process. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected API endpoint of the affected system. A successful exploit could allow the attacker to create or overwrite any file on the underlying operating system. This file could later be used to elevate to root. To exploit this vulnerability, the attacker must have valid credentials with at least a lower-privileged, single-task user account.

Weakness: CWE-22

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 · 22 branches to migrate

Cisco Catalyst SD-WAN Manager

Source: cisco-sa-sdwan-arbfw-c2rZvQCVE-2026-20262

  1. 26.1
    Affected versions26.1.1, 26.1.1.1
    First fixed release26.1.1.2
  2. 26.0
    Affected versions26.0.1
    First fixed releaseMigration to a fixed release requiredTarget: 26.1.1.2 or later
  3. 20.18
    Affected versions20.18.1, 20.18.2, 20.18.2.1, 20.18.2.2
    5 releases listed20.18.1, 20.18.2, 20.18.2.1, 20.18.2.2, 20.18.3
    First fixed releaseMigration to a fixed release requiredTarget: 26.1.1.2 or later
  4. 20.16
    Affected versions20.16.1
    First fixed releaseMigration to a fixed release requiredTarget: 26.1.1.2 or later
  5. 20.15
    Affected versions20.15.1, 20.15.2, 20.15.3, 20.15.3.1
    12 releases listed20.15.1, 20.15.2, 20.15.3, 20.15.3.1, 20.15.4, 20.15.4.1, 20.15.4.2, 20.15.4.3, 20.15.4.4, 20.15.5, 20.15.5.1, 20.15.5.2
    First fixed release20.15.4.520.15.5.3
  6. 20.14
    Affected versions20.14.1
    First fixed releaseMigration to a fixed release requiredTarget: 20.15.4.5, 20.15.5.3, 26.1.1.2 or later
  7. 20.13
    Affected versions20.13.1
    First fixed releaseMigration to a fixed release requiredTarget: 20.15.4.5, 20.15.5.3, 26.1.1.2 or later
  8. 20.12
    Affected versions20.12.1, 20.12.2, 20.12.3, 20.12.3.1
    22 releases listed20.12.1, 20.12.2, 20.12.3, 20.12.3.1, 20.12.4, 20.12.4.0.3, 20.12.4.0.4, 20.12.4.0.6, 20.12.4.1, 20.12.5, 20.12.5.1, 20.12.5.1.1, 20.12.5.2, 20.12.5.3, 20.12.5.4, 20.12.6, 20.12.6.1, 20.12.6.2, 20.12.7, 20.12.7.1, 20.12.401, 20.12.501
    First fixed release20.12.7.2
  9. 20.11
    Affected versions20.11.1, 20.11.1.1, 20.11.1.2
    First fixed releaseMigration to a fixed release requiredTarget: 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2 or later
  10. 20.10
    Affected versions20.10.1, 20.10.1.1, 20.10.1.2
    First fixed releaseMigration to a fixed release requiredTarget: 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2 or later
  11. 20.9
    Affected versions20.9.1, 20.9.1.1, 20.9.2, 20.9.2.0.1
    52 releases listed20.9.1, 20.9.1.1, 20.9.2, 20.9.2.0.1, 20.9.2.1, 20.9.2.2, 20.9.2.3, 20.9.3, 20.9.3.0.2, 20.9.3.0.3, 20.9.3.0.4, 20.9.3.0.5, 20.9.3.0.7, 20.9.3.0.8, 20.9.3.0.12, 20.9.3.0.16, 20.9.3.0.17, 20.9.3.0.18, 20.9.3.0.20, 20.9.3.0.21, 20.9.3.0.23, 20.9.3.0.24, 20.9.3.0.25, 20.9.3.0.26, 20.9.3.0.29, 20.9.3.1, 20.9.3.2, 20.9.4, 20.9.4.0.4, 20.9.4.1, 20.9.4.1.1, 20.9.4.1.3, 20.9.4.1.6, 20.9.5, 20.9.5.1, 20.9.5.1.4, 20.9.5.2, 20.9.5.2.1, 20.9.5.2.7, 20.9.5.2.13, 20.9.5.2.14, 20.9.5.2.16, 20.9.5.2.21, 20.9.5.3, 20.9.6, 20.9.6.0.3, 20.9.7, 20.9.7.1, 20.9.8, 20.9.8.2, 20.9.9, 20.9.9.1
    First fixed release20.9.9.2
  12. 20.8
    Affected versions20.8.1
    First fixed releaseMigration to a fixed release requiredTarget: 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2 or later
  13. 20.7
    Affected versions20.7.1, 20.7.1.0.2, 20.7.1.1, 20.7.2
    First fixed releaseMigration to a fixed release requiredTarget: 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2 or later
  14. 20.6
    Affected versions20.6.0.18.3, 20.6.0.18.4, 20.6.1, 20.6.1.0.1
    74 releases listed20.6.0.18.3, 20.6.0.18.4, 20.6.1, 20.6.1.0.1, 20.6.1.1, 20.6.1.2, 20.6.2, 20.6.2.0.4, 20.6.2.1, 20.6.2.2, 20.6.2.2.2, 20.6.2.2.3, 20.6.2.2.4, 20.6.2.2.7, 20.6.3, 20.6.3.0.2, 20.6.3.0.5, 20.6.3.0.7, 20.6.3.0.10, 20.6.3.0.11, 20.6.3.0.14, 20.6.3.0.18, 20.6.3.0.19, 20.6.3.0.23, 20.6.3.0.25, 20.6.3.0.27, 20.6.3.0.29, 20.6.3.0.31, 20.6.3.0.32, 20.6.3.0.33, 20.6.3.0.38, 20.6.3.0.39, 20.6.3.0.40, 20.6.3.0.41, 20.6.3.0.45, 20.6.3.0.46, 20.6.3.0.47, 20.6.3.0.51, 20.6.3.1, 20.6.3.1.1, 20.6.3.2, 20.6.3.3, 20.6.3.4, 20.6.4, 20.6.4.0.4, 20.6.4.0.19, 20.6.4.0.21, 20.6.4.1, 20.6.4.2, 20.6.5, 20.6.5.1, 20.6.5.1.2, 20.6.5.1.3, 20.6.5.1.4, 20.6.5.1.5, 20.6.5.1.6, 20.6.5.1.7, 20.6.5.1.9, 20.6.5.1.10, 20.6.5.1.11, 20.6.5.1.13, 20.6.5.1.14, 20.6.5.2, 20.6.5.2.1, 20.6.5.2.3, 20.6.5.2.4, 20.6.5.2.8, 20.6.5.3, 20.6.5.4, 20.6.5.5, 20.6.6, 20.6.6.0.1, 20.6.7, 20.6.8
    First fixed releaseMigration to a fixed release requiredTarget: 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2 or later
  15. 20.5
    Affected versions20.5.0.1.1, 20.5.1, 20.5.1.0.1, 20.5.1.0.2
    6 releases listed20.5.0.1.1, 20.5.1, 20.5.1.0.1, 20.5.1.0.2, 20.5.1.1, 20.5.1.2
    First fixed releaseMigration to a fixed release requiredTarget: 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2 or later
  16. 20.4
    Affected versions20.4.1, 20.4.1.0.1, 20.4.1.0.2, 20.4.1.1
    19 releases listed20.4.1, 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, 20.4.2.0.1, 20.4.2.0.2, 20.4.2.0.4, 20.4.2.1, 20.4.2.1.1, 20.4.2.2, 20.4.2.2.1, 20.4.2.2.2, 20.4.2.2.3, 20.4.2.2.4, 20.4.2.2.8, 20.4.2.3
    First fixed releaseMigration to a fixed release requiredTarget: 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2 or later
  17. 20.3
    Affected versions20.3.1, 20.3.2, 20.3.2.0.5, 20.3.2.0.6
    50 releases listed20.3.1, 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, 20.3.3.0.17, 20.3.3.0.18, 20.3.3.1, 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, 20.3.4.0.5, 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, 20.3.4.0.26, 20.3.4.1, 20.3.4.1.1, 20.3.4.1.2, 20.3.4.2, 20.3.4.2.1, 20.3.4.2.2, 20.3.4.3, 20.3.5, 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, 20.3.7.2, 20.3.8, 20.3.813, 20.3.814
    First fixed releaseMigration to a fixed release requiredTarget: 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2 or later
  18. 20.1
    Affected versions20.1.1, 20.1.1.1, 20.1.2, 20.1.3
    6 releases listed20.1.1, 20.1.1.1, 20.1.2, 20.1.3, 20.1.3.1, 20.1.12
    First fixed releaseMigration to a fixed release requiredTarget: 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2 or later
  19. 19.3
    Affected versions19.3
    First fixed releaseMigration to a fixed release requiredTarget: 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2 or later
  20. 19.2
    Affected versions19.2, 19.2.1, 19.2.2, 19.2.3
    14 releases listed19.2, 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 requiredTarget: 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2 or later
  21. 19.1
    Affected versions19.1
    First fixed releaseMigration to a fixed release requiredTarget: 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2 or later
  22. 19.0
    Affected versions19.0, 19.0.1a
    First fixed releaseMigration to a fixed release requiredTarget: 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2 or later
  23. 18.4
    Affected versions18.4, 18.4.0.1, 18.4.1, 18.4.3
    9 releases listed18.4, 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 requiredTarget: 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2 or later
  24. 18.3
    Affected versions18.3, 18.3.1, 18.3.1.1, 18.3.3
    11 releases listed18.3, 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 requiredTarget: 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2 or later
  25. 18.2
    Affected versions18.2
    First fixed releaseMigration to a fixed release requiredTarget: 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2 or later
  26. 17.2
    Affected versions17.2.4, 17.2.5, 17.2.6, 17.2.7
    7 releases listed17.2.4, 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 requiredTarget: 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2 or later

Remediation

Fix available

Vendor fix

  • Catalyst SD-WAN Manager 26.126.1.1.2
  • Catalyst SD-WAN Manager 20.1520.15.4.5, 20.15.5.3
  • Catalyst SD-WAN Manager 20.1220.12.7.2
  • Catalyst SD-WAN Manager 20.920.9.9.2

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 26.0 → 26.1.1.2
  • Catalyst SD-WAN Manager 20.18 → 26.1.1.2
  • Catalyst SD-WAN Manager 20.16 → 26.1.1.2
  • Catalyst SD-WAN Manager 20.14 → 20.15.4.5, 20.15.5.3, 26.1.1.2
  • Catalyst SD-WAN Manager 20.13 → 20.15.4.5, 20.15.5.3, 26.1.1.2
  • Catalyst SD-WAN Manager 20.11 → 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2
  • Catalyst SD-WAN Manager 20.10 → 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2
  • Catalyst SD-WAN Manager 20.8 → 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2
  • Catalyst SD-WAN Manager 20.7 → 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2
  • Catalyst SD-WAN Manager 20.6 → 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2
  • Catalyst SD-WAN Manager 20.5 → 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2
  • Catalyst SD-WAN Manager 20.4 → 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2
  • Catalyst SD-WAN Manager 20.3 → 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2
  • Catalyst SD-WAN Manager 20.1 → 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2
  • Catalyst SD-WAN Manager 19.3 → 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2
  • Catalyst SD-WAN Manager 19.2 → 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2
  • Catalyst SD-WAN Manager 19.1 → 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2
  • Catalyst SD-WAN Manager 19.0 → 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2
  • Catalyst SD-WAN Manager 18.4 → 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2
  • Catalyst SD-WAN Manager 18.3 → 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2
  • Catalyst SD-WAN Manager 18.2 → 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2
  • Catalyst SD-WAN Manager 17.2 → 20.9.9.2, 20.12.7.2, 20.15.4.5, 20.15.5.3, 26.1.1.2

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

SourceCisco Security Advisory cisco-sa-sdwan-arbfw-c2rZvQ

Workarounds (vendor)

Cisco states in its advisory that no workaround is available.

SourceCisco Security Advisory cisco-sa-sdwan-arbfw-c2rZvQ

CISA KEV required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes).

Full CISA action

Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

CISA due date:

SourceCISA KEV

CERT-FR recommendation

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

SourceCERTFR-2026-AVI-0756

Last verified 1 Oct 2026 at 09:31 UTC

Known exploitation

Added to CISA KEV on 15 Jun 2026

Federal remediation due date: 29 Jun 2026

The CISA required action is shown under Remediation.

28% probability of exploitation in the next 30 days (percentile 98%).

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

CERT-FR

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

Advisory (AVI)CERTFR-2026-AVI-0756Published 16 Jun 2026

Vulnerability in Cisco Catalyst

Data integrity breach

Summary

A vulnerability has been discovered in Cisco Catalyst. It allows an attacker to cause a data integrity breach. Cisco indicates that vulnerability CVE-2026-20262 is being 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 20:03 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

  1. Added to CISA KEV
  2. Published by the source
  3. CISA remediation due date
  4. Source record last modified
  5. EPSS score computed
  6. Last verified by Patcharo

Official sources

References

Cisco · CISA Known Exploited Vulnerabilities · NVD · FIRST EPSS · Cisco Security Advisory cisco-sa-sdwan-arbfw-c2rZvQ

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