CVE-2020-26066 | Cisco SD-WAN vManage Software XML External Entity Vulnerability

A vulnerability in the web UI of Cisco SD-WAN vManage Software could allow an authenticated, remote attacker to gain read and write access to information that is stored on an affected system. The vulnerability is due to improper handling of XML External Entity (XXE) entries when parsing certain XML files. An attacker could exploit this vulnerability by persuading a user to import a crafted XML file with malicious entries. A successful exploit could allow the attacker to read and write files within the affected application.Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

Published: 2024-11-18 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-26066 is rated Moderate Risk (41.5/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.59%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-26066

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.16% 0.59% +0.43%
2 2026-04-09 0.05% 0.16% +0.10%
3 2025-11-21 — 0.05% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-26066

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.0 MEDIUM
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 3.6 [email protected]

Weakness enumeration for CVE-2020-26066

Affected software / configurations for CVE-2020-26066

Vendor Product Version Raw CPE
cisco catalyst_sd-wan_manager 17.2.4 cpe:2.3:a:cisco:catalyst_sd-wan_manager:17.2.4:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 17.2.5 cpe:2.3:a:cisco:catalyst_sd-wan_manager:17.2.5:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 17.2.6 cpe:2.3:a:cisco:catalyst_sd-wan_manager:17.2.6:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 17.2.7 cpe:2.3:a:cisco:catalyst_sd-wan_manager:17.2.7:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 17.2.8 cpe:2.3:a:cisco:catalyst_sd-wan_manager:17.2.8:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 17.2.9 cpe:2.3:a:cisco:catalyst_sd-wan_manager:17.2.9:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 17.2.10 cpe:2.3:a:cisco:catalyst_sd-wan_manager:17.2.10:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.2.0 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.2.0:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.3.0 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.3.0:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.3.1 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.3.1:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.3.1.1 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.3.1.1:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.3.3 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.3.3:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.3.3.1 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.3.3.1:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.3.4 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.3.4:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.3.5 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.3.5:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.3.6 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.3.6:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.3.6.1 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.3.6.1:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.3.7 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.3.7:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.3.8 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.3.8:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.4.0 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.4.0:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.4.0.1 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.4.0.1:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.4.1 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.4.1:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.4.3 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.4.3:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.4.4 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.4.4:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.4.5 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.4.5:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.4.302 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.4.302:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.4.303 cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.4.303:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 18.4.501_es cpe:2.3:a:cisco:catalyst_sd-wan_manager:18.4.501_es:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 19.0.0 cpe:2.3:a:cisco:catalyst_sd-wan_manager:19.0.0:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 19.0.1a cpe:2.3:a:cisco:catalyst_sd-wan_manager:19.0.1a:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 19.1.0 cpe:2.3:a:cisco:catalyst_sd-wan_manager:19.1.0:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 19.2.0 cpe:2.3:a:cisco:catalyst_sd-wan_manager:19.2.0:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 19.2.1 cpe:2.3:a:cisco:catalyst_sd-wan_manager:19.2.1:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 19.2.2 cpe:2.3:a:cisco:catalyst_sd-wan_manager:19.2.2:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 19.2.3 cpe:2.3:a:cisco:catalyst_sd-wan_manager:19.2.3:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 19.2.31 cpe:2.3:a:cisco:catalyst_sd-wan_manager:19.2.31:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 19.2.097 cpe:2.3:a:cisco:catalyst_sd-wan_manager:19.2.097:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 19.2.098 cpe:2.3:a:cisco:catalyst_sd-wan_manager:19.2.098:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 19.2.099 cpe:2.3:a:cisco:catalyst_sd-wan_manager:19.2.099:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 19.2.929 cpe:2.3:a:cisco:catalyst_sd-wan_manager:19.2.929:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 19.3.0 cpe:2.3:a:cisco:catalyst_sd-wan_manager:19.3.0:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 20.1.1 cpe:2.3:a:cisco:catalyst_sd-wan_manager:20.1.1:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 20.1.1.1 cpe:2.3:a:cisco:catalyst_sd-wan_manager:20.1.1.1:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 20.1.12 cpe:2.3:a:cisco:catalyst_sd-wan_manager:20.1.12:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager 20.3.1 cpe:2.3:a:cisco:catalyst_sd-wan_manager:20.3.1:*:*:*:*:*:*:*

References for CVE-2020-26066

cvelogic Threat Intelligence