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vulnerability

CVE-2026-20133

6.5
Medium
KEV · Exploited in wildEPSS 31%Patch available

A vulnerability in Cisco Catalyst SD-WAN Software could allow an unauthenticated, remote attacker to view sensitive information on an affected system. This vulnerability is due to insufficient file system restrictions. An authenticated attacker with netadmin privileges could exploit this vulnerability by accessing the vshell of an affected system. A successful exploit could allow the attacker to read sensitive information on the underlying operating system.

exploited
Yes, in CISA KEV since 20 Apr 2026fix by 23 Apr 2026 (CISA deadline for US federal agencies)
fix
Patch available see the advisory in the references
likelihood
EPSS 31.5%
Published 25 Feb 2026Analysed here 2 Nov 2026CVSS scored by the publisher (CNA)

do firstPlease 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.

triage
server-sideruntimeWAF can block: noAV · networkCWE-200· Information Exposure

Can a WAF block it? No. The vulnerability requires an attacker with netadmin privileges to access the vshell, which is not delivered via HTTP but through another network protocol or interface. Since the attacker must be authenticated with elevated privileges, the malicious input does not appear in normal HTTP requests and cannot be filtered by a web application firewall.

Also consider: response filtering

Based on an AI reading of the CVE description, and no vendor rule found yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.

cvss vector
attack vectornetworkattack complexitylowprivileges requiredlowuser interactionnonescopeunchangedconfidentialityhighintegritynoneavailabilitynone
CVSS 3.1 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
common questions

Is CVE-2026-20133 being exploited?

Yes. CVE-2026-20133 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.

How severe is CVE-2026-20133?

CVE-2026-20133 is rated Medium with a CVSS score of 6.5. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2026-20133?

Yes. A fix has been recorded for CVE-2026-20133. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2026-20133 affect?

CVE-2026-20133 affects cisco:catalyst_sd-wan_manager. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary
technical analysis
affected
cisco:catalyst_sd-wan_manager
affected versions
Cisco Cisco Catalyst SD-WAN Manager
  • affected17.2.6
  • affected17.2.7
  • affected17.2.8
  • affected17.2.9
  • affected17.2.10
  • affected17.2.4
  • affected17.2.5
  • affected18.3.1.1
  • affected18.3.3.1
  • affected18.3.3
  • affected18.3.4
  • affected18.3.5
  • affected18.3.7
  • affected18.3.8
  • affected18.3.6.1
  • affected18.3.1
  • affected18.3.0
  • affected18.4.0.1
  • affected18.4.3
  • affected18.4.302
  • affected18.4.303
  • affected18.4.4
  • affected18.4.5
  • affected18.4.0
  • affected18.4.1
  • affected18.4.6
  • affected19.2.0
  • affected19.2.097
  • affected19.2.099
  • affected19.2.1
  • affected19.2.2
  • affected19.2.3
  • affected19.2.31
  • affected19.2.929
  • affected19.2.4
  • affected20.1.1.1
  • affected20.1.12
  • affected20.1.1
  • affected20.1.2
  • affected20.1.3
  • affected19.3.0
  • affected19.1.0
  • affected18.2.0
  • affected20.3.1
  • affected20.3.2
  • affected20.3.2.1
  • affected20.3.3
  • affected20.3.3.1
  • affected20.3.4
  • affected20.3.4.1
  • affected20.3.4.2
  • affected20.3.5
  • affected20.3.6
  • affected20.3.7
  • affected20.3.7.1
  • affected20.3.4.3
  • affected20.3.5.1
  • affected20.3.7.2
  • affected20.3.8
  • affected20.4.1
  • affected20.4.1.1
  • affected20.4.1.2
  • affected20.4.2
  • affected20.4.2.2
  • affected20.4.2.1
  • affected20.4.2.3
  • affected20.5.1
  • affected20.5.1.2
  • affected20.5.1.1
  • affected20.6.1
  • affected20.6.1.1
  • affected20.6.2.1
  • affected20.6.2.2
  • affected20.6.2
  • affected20.6.3
  • affected20.6.3.1
  • affected20.6.4
  • affected20.6.5
  • affected20.6.5.1
  • affected20.6.5.3
  • affected20.6.1.2
  • affected20.6.3.2
  • affected20.6.4.1
  • affected20.6.5.2
  • affected20.6.5.4
  • affected20.6.3.3
  • affected20.6.4.2
  • affected20.6.3.0.45
  • affected20.6.3.0.46
  • affected20.6.3.0.47
  • affected20.6.3.4
  • affected20.6.4.0.21
  • affected20.6.5.1.10
  • affected20.6.5.1.11
  • affected20.6.5.1.7
  • affected20.6.5.1.9
  • affected20.6.5.2.4
  • affected20.6.5.5
  • affected20.6.5.2.8
  • affected20.6.5.1.13
  • affected20.6.6
  • affected20.6.7
  • affected20.6.8
  • affected20.7.1
  • affected20.7.1.1
  • affected20.7.2
  • affected20.8.1
  • affected20.9.1
  • affected20.9.2
  • affected20.9.2.1
  • affected20.9.3
  • affected20.9.3.1
  • affected20.9.2.3
  • affected20.9.3.0.12
  • affected20.9.3.0.16
  • affected20.9.3.0.17
  • affected20.9.3.0.18
  • affected20.9.3.0.20
  • affected20.9.3.0.21
  • affected20.9.3.2
  • affected20.9.3.2_LI_Images
  • affected20.9.4
  • affected20.9.4_LI_Images
  • affected20.9.3.0.23
  • affected20.9.4.1
  • affected20.9.5
  • affected20.9.5.1
  • affected20.9.5.2
  • affected20.9.6
  • affected20.9.5.3
  • affected20.9.7
  • affected20.9.7.1
  • affected20.9.8
  • affected20.10.1
  • affected20.10.1.1
  • affected20.10.1.2
  • affected20.11.1
  • affected20.11.1.1
  • affected20.11.1.2
  • affected20.12.1
  • affected20.12.1_LI_Images
  • affected20.12.2
  • affected20.12.3
  • affected20.12.3.1
  • affected20.12.4
  • affected20.12.4.1
  • affected20.12.5
  • affected20.12.5.1
  • affected20.12.5.2
  • affected20.12.6
  • affected20.13.1
  • affected20.14.1
  • affected20.15.1
  • affected20.15.2
  • affected20.15.3
  • affected20.15.3.1
  • affected20.15.4
  • affected20.15.4.1
  • affected20.16.1
  • affected20.18.1
  • affected20.18.2

As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.

cisa ssvc

exploitation
active
automatable
no
technical impact
partial

Assessed by CISA 22 Apr 2026 (SSVC 2.0.3).

timeline

  1. 25 Feb 2026Published
  2. 20 Apr 2026Added to CISA KEV (exploited in the wild) · 53 days later
  3. 22 Apr 2026CISA SSVC assessment: exploitation active · 3 days later
  4. 22 Apr 2026CVE record last updated · same day later
  5. 23 Apr 2026CISA remediation due date (US federal agencies) · same day later
  6. 2 Nov 2026Analysed by vulneraibility.com · 194 days (about 6 months) later
how to fix
Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.
references
NVDCVE.orgCVE DetailsSource
2 references in the CVE record: 2 links
  • Linksec.cloudapps.cisco.com /security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v
  • Linkcisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20133

sources

  • CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
  • NVD: CVSS and CPE data
  • CISA KEV catalog: exploitation, date added, due date
  • CISA Vulnrichment (ADP): SSVC decision points
  • FIRST EPSS: exploit probability and percentile
  • Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.
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