EUVD-2026-53471
GHSA-fhhx-46fx-737r
Severity by source
AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Reachable over the management network at low complexity but gated by administrative access (PR:H); symlink abuse crosses a host boundary (S:C) enabling file read, overwrite, and destruction (C/I/A:H).
Primary rating from Vendor (cisco).
CVSS VectorVendor: cisco
Lifecycle Timeline
2DescriptionCVE.org
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Catalyst SD-WAN engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.
The vulnerabilities tracked by CVE-2026-20310 are related to improper link resolution before file access issues that are grouped under the Common Weakness Enumeration (CWE) CWE-59.
AnalysisAI
Privileged file manipulation in Cisco Catalyst SD-WAN Manager and SD-WAN Controller allows an authenticated attacker to abuse improper symbolic-link resolution (CWE-59) to read, overwrite, or destroy files outside intended boundaries, with a scope-changing impact that reaches beyond the vulnerable process. The flaw was found during Cisco's internal SD-WAN security review and remediated in hardening releases; it carries a CVSS 9.1 rating driven by network reach, low complexity, and high confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already hold high (administrative) privileges on the Cisco Catalyst SD-WAN Manager or SD-WAN Controller management plane (CVSS PR:H), reachable over the network (AV:N) with low complexity (AC:L) and no user interaction (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H yields 9.1 (Critical), but the individual metrics tell a more nuanced story: AV:N and AC:L lower the bar, while PR:H means the attacker must already hold high (administrative) privileges on the SD-WAN management plane, which is the dominant limiting factor. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to the fixed SD-WAN Manager and SD-WAN Controller releases identified in Cisco advisory cisco-sa-hardening-sdwan-faLcR3K (https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-sdwan-faLcR3K); patch available per vendor advisory, but no single exact fixed version string is included in the provided data, so consult the advisory's fixed-release table to map your current train (17.2.x/18.x/19.x/20.x/26.1.x) to its patched build. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Cisco SD-WAN Manager and Controller instances in production, document current versions, and verify that management-plane access is restricted to trusted administrative personnel only. …
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Privilege escalation and cross-boundary information disclosure in Cisco Catalyst SD-WAN Manager and SD-WAN Controller st
Privilege escalation and authentication-boundary bypass in Cisco Catalyst SD-WAN Manager and SD-WAN Controller allows a
Cleartext storage of sensitive information in Cisco Catalyst SD-WAN Controller and Manager exposes credentials or other
Remote availability disruption in Cisco Catalyst SD-WAN Manager and Controller allows a low-privileged authenticated att
Same weakness CWE-59 – Improper Link Resolution Before File Access
View allSame technique Information Disclosure
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External POC / Exploit Code
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