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CVE-2026-20122· NVD / CVE Program· CNA cisco

Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability

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.

MediumCVSS 5.4 · v3.1KEVWeaponized No fix recorded
Published
Feb 25, 2026
Updated
Jun 17, 2026
EPSS
25.0% · 98th percentile
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Report tools

JSON

Action score

58

Plan

Add it to your regular patch cycle.

CVSS
21 / 40 · 5.4 / 10
CISA KEV
30 / 30 · Listed
EPSS
7 / 30 · 25.0%

CISA SSVC decision

Exploitation
active
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.4
CNA · cisco
5.4
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Apr 20, 2026. That signals real attacks, not theory.

Remediation deadline for government agencies: Apr 23, 2026.

Affected systems

VendorProduct
ciscocatalyst sd-wan manager

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • cisco catalyst sd-wan managerbefore 20.9.8.2
  • cisco catalyst sd-wan manager20.10 and later · before 20.12.5.3
  • cisco catalyst sd-wan manager20.13 and later · before 20.15.4.2
  • cisco catalyst sd-wan manager20.16 and later · before 20.18.2.1
  • cisco catalyst sd-wan manager20.12.6

Versions reported by the vendor

Affected version ranges reported by the assigning authority (cisco). Independent of NVD's CPE analysis and usually ahead of it.

  • Cisco Cisco Catalyst SD-WAN Manager

    • 20.1.12, 19.2.1, 18.4.4, 18.4.5, 20.1.1.1, 20.1.1, 19.3.0, 19.2.2, 19.2.099, 18.3.6, 18.3.7, 19.2.0 … (+28)affected

Same product

cisco: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-20182Cisco Catalyst SD-WAN Controller Authentication Bypass VulnerabilityKEV
    97Now
  • CVE-2026-20127Cisco Catalyst SD-WAN Controller Authentication Bypass VulnerabilityKEV
    97Now
  • CVE-2026-20133A vulnerability in Cisco Catalyst SD-WAN Software could allow an unauthenticated, remote attacker to view sensitive information on an affectKEV
    70This week
  • CVE-2026-20245Cisco Catalyst SD-WAN Controller Authenticated Privilege Escalation VulnerabilityKEV
    69This week
  • CVE-2022-20775Cisco SD-WAN Software Privilege Escalation VulnerabilityKEV
    65This week
  • CVE-2026-20262Cisco Catalyst SD-WAN Manager Arbitrary File Write VulnerabilityKEV
    64This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. CISA KEV+53 d
  3. TodaySep 30, 2026+217 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-201260 days apartCisco Catalyst SD-WAN Manager Privilege Escalation Vulnerability
    31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-648 · Incorrect Use of Privileged APIs

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records