CVE Intelligence
CISA KEV Medium File handling

CVE-2026-20262 — Cisco Catalyst SD-WAN Manager Directory or Path Traversal Vulnerability

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.

Published Jun 15, 2026 · Updated Oct 13, 2026 · Sources: CISA Known Exploited Vulnerabilities, NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: cisco

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

CISA KEV · Jun 15, 2026 Proofs of concept on GitHub · 2
How the score was calculated
  • Confirmed exploitation (CISA KEV)+35
  • Public exploit/PoC (github)+6
  • EPSS 28.2% (30-day exploitation probability)+15
  • Technical severity (medium)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Confirmed
CISA KEV, listed Jun 15, 2026
EPSS FIRST
28.17%
ahead of 98% of scored CVEs · Oct 14, 2026
Affects
Cisco
Catalyst Sd-wan Manager
CVSS base
6.5
Medium · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
Active
none · proof-of-concept · active
Automatable
No
can an attacker script the kill-chain steps
Technical impact
Partial
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

CISA required action CISA

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). 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.

US federal deadline: Jun 29, 2026 — passed 108 day(s) ago

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Cisco Catalyst Sd-wan Manager).
  2. Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
  3. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
  4. EPSS ahead of 98% of scored CVEs: prioritize it in the patch queue.
  5. Search available logs for exploit probes matching the vulnerability class (file handling), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Cisco Catalyst Sd-wan Manager version 20.12.6.2_LI_Imagesversion 20.9.9.1version 20.9.9.1_LI_Imagesversion 26.1.1.1version 20.15.4.4_LI_Imagesversion 20.15.4.4version 26.1.1.1_LI_Imagesversion 20.15.5.2_LI_Images
and 286 more version 20.15.5.2version 20.12.6.2version 20.15.5.1_LI_Imagesversion 20.15.4.3_LI_Imagesversion 20.15.4.3version 20.15.5.1version 20.12.7.1version 20.9.8.2_LI_Imagesversion 20.12.7.1_LI_Imagesversion 20.12.5.4_LI_ Imagesversion 20.12.5.4version 20.18.2.2_LI_Imagesversion 20.18.2.2version 20.9.9_LI_Imagesversion 20.9.9version 20.12.7_LI_Imagesversion 20.12.7version 20.15.5_LI_Imagesversion 20.15.5version 20.18.3_LI_Imagesversion 20.18.3version 20.9.8.2version 20.1.12version 19.2.1version 18.4.4version 18.4.5version 20.1.1.1version 20.1.1version 19.3.0version 19.2.2version 19.2.099version 18.3.6version 18.3.7version 19.2.0version 18.3.8version 19.0.0version 19.1.0version 18.4.302version 18.4.303version 19.2.097version 19.2.098version 17.2.10version 18.3.6.1version 19.0.1aversion 18.2.0version 18.4.3version 18.4.1version 17.2.8version 18.3.3.1version 18.4.0version 18.3.1version 17.2.6version 17.2.9version 18.3.4version 17.2.5version 18.3.1.1version 18.3.5version 18.4.0.1version 18.3.3version 17.2.7version 17.2.4version 18.3.0version 19.2.3version 18.4.501_ESversion 20.3.1version 20.1.2version 19.2.929version 19.2.31version 20.3.2version 19.2.32version 20.3.2_925version 20.3.2.1version 20.3.2.1_927version 18.4.6version 20.1.2_937version 20.4.1version 20.3.2_928version 20.3.2_929version 20.4.1.0.1version 20.3.2.1_930version 19.2.4version 20.5.0.1.1version 20.4.1.1version 20.3.3version 19.2.4.0.1version 20.3.2_937version 20.3.3.1version 20.5.1version 20.1.3version 20.3.3.0.4version 20.3.3.1.2version 20.3.3.1.1version 20.4.1.2version 20.3.3.0.2version 20.4.1.1.5version 20.4.1.0.01version 20.4.1.0.02version 20.3.3.1.7version 20.3.3.1.5version 20.5.1.0.1version 20.3.3.1.10version 20.3.3.0.8version 20.4.2version 20.4.2.0.1version 20.3.4version 20.3.3.0.14version 19.2.4.0.8version 19.2.4.0.9version 20.3.4.0.1version 20.3.2.0.5version 20.6.1version 20.5.1.0.2version 20.3.3.0.17version 20.6.1.1version 20.6.0.18.3version 20.3.2.0.6version 20.6.0.18.4version 20.4.2.0.2version 20.3.3.0.16version 20.3.4.0.5version 20.6.1.0.1version 20.3.4.0.6version 20.6.2version 20.7.1EFT2version 20.3.4.0.9version 20.3.4.0.11version 20.4.2.0.4version 20.3.3.0.18version 20.7.1version 20.6.2.1version 20.3.4.1version 20.5.1.1version 20.4.2.1version 20.4.2.1.1version 20.3.4.1.1version 20.3.813version 20.3.4.0.19version 20.4.2.2.1version 20.5.1.2version 20.3.4.2version 20.3.814version 20.4.2.2version 20.6.2.2version 20.3.4.2.1version 20.7.1.1version 20.3.4.1.2version 20.6.2.2.2version 20.3.4.0.20version 20.6.2.2.3version 20.4.2.2.2version 20.3.5version 20.6.2.0.4version 20.4.2.2.3version 20.3.4.0.24version 20.6.2.2.7version 20.6.3version 20.3.4.2.2version 20.4.2.2.4version 20.7.1.0.2version 20.8.1version 20.3.5.0.8version 20.3.5.0.9version 20.4.2.2.8version 20.3.5.0.7version 20.6.3.0.7version 20.6.3.0.5version 20.6.3.0.10version 20.6.3.0.2version 20.7.2version 20.9.1EFT2version 20.6.3.0.11version 20.6.3.1version 20.6.3.0.14version 20.6.4version 20.9.1version 20.6.3.0.19version 20.6.3.0.18version 20.3.6version 20.9.1.1version 20.6.3.0.23version 20.6.4.0.4version 20.6.3.0.25version 20.6.5version 20.6.3.0.27version 20.9.2version 20.9.2.1version 20.6.3.0.29version 20.6.3.0.31version 20.6.3.0.32version 20.10.1version 20.6.3.0.33version 20.9.2.0.01version 20.9.1_LI_Imagesversion 20.10.1_LI_Imagesversion 20.9.2_LI_Imagesversion 20.3.7version 20.9.3version 20.6.5.1version 20.11.1version 20.11.1_LI_Imagesversion 20.9.3_LI_ Imagesversion 20.6.3.1.1version 20.9.3.0.2version 20.6.5.1.2version 20.9.3.0.3version 20.4.2.3version 20.6.3.2version 20.6.4.1version 20.6.3.0.38version 20.6.3.0.39version 20.3.5.1version 20.3.4.3version 20.9.3.1version 20.3.3.2version 20.6.5.2version 20.3.7.1version 20.10.1.1version 20.6.5.2.1version 20.3.4.0.25version 20.6.2.2.4version 20.6.1.2version 20.11.1.1version 20.9.3.0.5version 20.3.4.0.26version 20.6.5.1.3version 20.6.3.0.40version 20.1.3.1version 20.9.2.2version 20.6.5.2.3version 20.6.5.1.4version 20.6.5.3version 20.6.3.0.41version 20.9.3.0.7version 20.6.5.1.5version 20.9.3.0.4version 20.6.4.0.19version 20.6.5.1.6version 20.9.3.0.8version 20.6.3.3version 20.3.7.2version 20.6.5.4version 20.6.5.1.7version 20.9.3.0.12version 20.6.4.2version 20.6.5.5version 20.9.3.2version 20.11.1.2version 20.6.3.4version 20.10.1.2version 20.6.5.1.9version 20.9.3.0.16version 20.6.3.0.45version 20.6.5.1.10version 20.9.3.0.17version 20.6.5.2.4version 20.6.4.0.21version 20.9.3.0.18version 20.6.3.0.46version 20.6.3.0.47version 20.9.2.3version 20.9.3.2_LI_Imagesversion 20.9.3.0.21version 20.9.3.0.20version 20.9.4_LI_Imagesversion 20.9.4version 20.6.5.1.11version 20.12.1version 20.12.1_LI_Imagesversion 20.6.5.1.13version 20.9.3.0.23version 20.6.5.2.8version 20.9.4.1version 20.9.4.1_LI_Imagesversion 20.9.3.0.25version 20.9.3.0.24version 20.6.5.1.14version 20.3.8version 20.6.6version 20.9.3.0.26version 20.6.3.0.51version 20.9.3.0.29version 20.12.2version 20.12.2_LI_Imagesversion 20.6.6.0.1version 20.13.1_LI_Imagesversion 20.9.4.0.4
Vulnerable CVE Program (cve.org) e CISA ADP
Cisco Catalyst Sd-wan Manager < 20.9.9.2≥ 20.10 and < 20.12.7.2≥ 20.13 and < 20.15.4.5≥ 20.15.5 and < 20.15.5.3≥ 20.16 and < 20.18.3.1≥ 26.1 and < 26.1.1.2 Vulnerable NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
6.5 CVSS 3.1 Medium 2.8 3.6 psirt@cisco.com via NIST National Vulnerability Database
6.5 CVSS 3.1 Medium — — GitHub, Inc. via GitHub Security Advisories
6.5 CVSS 3.1 Medium — — cisco via CVE Program (cve.org) e CISA ADP
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N (score shown at the top: psirt@cisco.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-22 · Path Traversal

Other CVEs with this weakness →

CISA KEV details CISA

CISA lists a CVE once it has evidence of exploitation against real targets.

Listed
Jun 15, 2026
Federal deadline
Jun 29, 2026
passed 108 day(s) ago
Ransomware use
Unknown

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.

Public exploits, PoCs and detection templates

Public code that demonstrates or tests the flaw raises the odds of mass exploitation — and Nuclei templates help find vulnerable assets in your environment.

Proofs of concept on GitHub

Warning: public PoCs are sometimes disguised malware. Use them only for authorized testing in an isolated environment. This portal does not host exploit code — it only points to the sources.

EPSS over time FIRST

Oct 12, 2026 → Oct 14, 2026 · 3 reading(s) · max 28.17%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
  • Monitor file creation in web directories and paths with traversal sequences (../).
  • Hunt retroactively in logs from before Jun 15, 2026 (KEV listing): exploitation may have started earlier.
web/proxy/WAF logsnetwork IDS/IPSfile integrity (FIM)endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

  • 2026
  • Affected products added · cisco/cisco catalyst sd-wan manager
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • SSVC assessment updated
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 13, 2026
  • Affected products added · cisco/catalyst sd-wan manager
    Oct 13, 2026 · NIST National Vulnerability Database
  • CVSS changed · 6.5
    Oct 13, 2026 · NIST National Vulnerability Database
  • Source status changed · → Analyzed
    Oct 13, 2026 · NIST National Vulnerability Database
  • Added to CISA KEV (detected)
    Oct 13, 2026 · CISA Known Exploited Vulnerabilities
  • Record created in this database
    Oct 13, 2026 · CISA Known Exploited Vulnerabilities
  • CVE published
    Jun 15, 2026 · cisco
  • Added to CISA KEV catalog
    Jun 14, 2026 · CISA

Source activity

Repeated readings are counted rather than listed.

  • 2× References added · Oct 13, 2026 – Oct 13, 2026
  • 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

4 on the record

Elsewhere on this site

Cisco
every CVE for this vendor
2026-06
what else CISA listed that month
File handling
same class
CWE-22
other pages naming this weakness

Related CVEs (same products)

  • CVE-2026-76504 Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability KEV 15d
  • CVE-2026-20245 Cisco Catalyst SD-WAN Manager Improper Encoding or Escaping of Output Vulnerability KEV Jun 4, 2026
  • CVE-2026-20224 Cisco Catalyst SD-WAN Manager XML External Entity Injection Vulnerability May 14, 2026
  • CVE-2026-20210 Cisco Catalyst SD-WAN Manager Privilege Escalation Vulnerability May 14, 2026
  • CVE-2026-20182 Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability KEV May 14, 2026
  • CVE-2026-20209 Cisco Catalyst SD-WAN Manager Privilege Escalation Vulnerability May 14, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No fixed version, patch or mitigation documented.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-20262 is "Cisco Catalyst SD-WAN Manager Directory or Path Traversal Vulnerability", rated Medium. It affects Catalyst Sd-wan Manager (Cisco); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 6.5 describes technical severity. EPSS 28.17% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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