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Vulnerabilities

MediumKEV

CVE-2026-20122 — Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability

CVE-2026-20122 · Cisco Catalyst SD-WAN Manager · CVSS 5.4 · KEV

In brief

Severity · CVSS
Medium5.4CVSS 3.1, Medium
EPSS
25%
CISA KEV
Known exploited, listed since 20 Apr 2026
Vendor
Cisco
Published · Modified
·
Last verified

Summary

A vulnerability in the API of Cisco Catalyst SD-WAN Manager could allow an authenticated, remote attacker to overwrite arbitrary files on the local file system. To exploit this vulnerability, the attacker must have valid read-only credentials with API access on the affected system. This vulnerability is due to improper file handling on the API interface of an affected system. An attacker could exploit this vulnerability by uploading a malicious file on the local file system. A successful exploit could allow the attacker to overwrite arbitrary files on the affected system and gain vmanage user privileges.

Weakness: CWE-648

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 · 20 branches to migrate

Cisco Catalyst SD-WAN Manager

Source: cisco-sa-sdwan-authbp-qwCX8D4vCVE-2026-20122

  1. 20.18
    Affected versions20.18.1, 20.18.2
    First fixed release20.18.2.1
  2. 20.16
    Affected versions20.16.1
    First fixed releaseMigration to a fixed release requiredTarget: 20.18.2.1 or later
  3. 20.15
    Affected versions20.15.1, 20.15.2, 20.15.3, 20.15.3.1
    6 releases listed20.15.1, 20.15.2, 20.15.3, 20.15.3.1, 20.15.4, 20.15.4.1
    First fixed release20.15.4.2
  4. 20.14
    Affected versions20.14.1
    First fixed releaseMigration to a fixed release requiredTarget: 20.15.4.2 or later
  5. 20.13
    Affected versions20.13.1
    First fixed releaseMigration to a fixed release requiredTarget: 20.15.4.2 or later
  6. 20.12
    Affected versions20.12.1, 20.12.2, 20.12.3, 20.12.3.1
    16 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, 20.12.6, 20.12.401, 20.12.501
    First fixed release20.12.5.320.12.6.1
  7. 20.11
    Affected versions20.11.1, 20.11.1.1, 20.11.1.2
    First fixed releaseMigration to a fixed release requiredTarget: 20.12.6.1 or later
  8. 20.10
    Affected versions20.10.1, 20.10.1.1, 20.10.1.2
    First fixed releaseMigration to a fixed release requiredTarget: 20.12.6.1 or later
  9. 20.9
    Affected versions20.9.1, 20.9.1.1, 20.9.2, 20.9.2.0.1
    49 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
    First fixed release20.9.8.2
  10. 20.8
    Affected versions20.8.1
    First fixed releaseMigration to a fixed release required
  11. 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 required
  12. 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 required
  13. 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 required
  14. 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 required
  15. 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 required
  16. 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 required
  17. 19.3
    Affected versions19.3
    First fixed releaseMigration to a fixed release required
  18. 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 required
  19. 19.1
    Affected versions19.1
    First fixed releaseMigration to a fixed release required
  20. 19.0
    Affected versions19.0, 19.0.1a
    First fixed releaseMigration to a fixed release required
  21. 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 required
  22. 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 required
  23. 18.2
    Affected versions18.2
    First fixed releaseMigration to a fixed release required
  24. 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 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 20.8
  • 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:

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.

25% probability of exploitation in the next 30 days (percentile 98%).

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

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

  1. Published by the source
  2. Added to CISA KEV
  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-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 methodologyRead the guide: Cisco Secure Firewall release trains: Threat Defense, Management Center and ASA versions explained