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CVE-2020-3209

Cisco IOS XE Software Digital Signature Verification Bypass Vulnerability

MEDIUM

6.8

CVSS Score

Published: June 3, 2020 at 05:40 PM UTC

Updated: June 17, 2026 at 03:17 AM UTC

1 product affected across 1 vendorIOS Xe

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Severity

MEDIUM6.8

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

A vulnerability in software image verification in Cisco IOS XE Software could allow an unauthenticated, physical attacker to install and boot a malicious software image or execute unsigned binaries on an affected device. The vulnerability is due to an improper check on the area of code that manages the verification of the digital signatures of system image files during the initial boot process. An attacker could exploit this vulnerability by loading unsigned software on an affected device. A successful exploit could allow the attacker to install and boot a malicious software image or execute unsigned binaries on the targeted device.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

IOS Xe · Cisco

95%

16.1.1 16.1.2 16.1.3 16.10.1 16.10.1a 16.10.1b 16.10.1c 16.10.1d 16.10.1e 16.10.1f 16.10.1g 16.10.1s 16.10.2 16.11.1 16.11.1a 16.11.1b 16.12.1y 16.2.1 16.2.2 16.3.1 16.3.1a 16.3.2 16.3.3 16.3.4 16.3.5 16.3.5b 16.3.6 16.3.7 16.3.8 16.4.1 16.4.2 16.4.3 16.5.1 16.5.1a 16.5.1b 16.5.2 16.5.3 16.6.1 16.6.2 16.6.3 16.6.4 16.6.4a 16.6.4s 16.6.5 16.6.5a 16.6.5b 16.6.6 16.6.7 16.6.7a 16.7.1 16.7.1a 16.7.1b 16.7.2 16.7.3 16.7.4 16.8.1 16.8.1a 16.8.1b 16.8.1c 16.8.1d 16.8.1e 16.8.1s 16.8.2 16.8.3 16.9.1 16.9.1a 16.9.1b 16.9.1c 16.9.1d 16.9.1s 16.9.2 16.9.2a 16.9.2s 16.9.3 16.9.3h 16.9.3s 16.9.4 16.9.4c 3.10.0ce 3.10.0e 3.10.0s 3.10.10s 3.10.1ae 3.10.1e 3.10.1s 3.10.1se 3.10.2as 3.10.2e 3.10.2s 3.10.2ts 3.10.3e 3.10.3s 3.10.4s 3.10.5s 3.10.6s 3.10.7s 3.10.8as 3.10.8s 3.10.9s 3.11.0e 3.11.0s 3.11.1e 3.11.1s 3.11.2s 3.11.3e 3.11.3s 3.11.4s 3.12.0as 3.12.0s 3.12.1s 3.12.2s 3.12.3s 3.12.4s 3.13.0as 3.13.0s 3.13.10s 3.13.1s 3.13.2as 3.13.2s 3.13.3s 3.13.4s 3.13.5as 3.13.5s 3.13.6as 3.13.6bs 3.13.6s 3.13.7as 3.13.7s 3.13.8s 3.13.9s 3.14.0s 3.14.1s 3.14.2s 3.14.3s 3.14.4s 3.15.0s 3.15.1cs 3.15.1s 3.15.2s 3.15.3s 3.15.4s 3.16.0as 3.16.0bs 3.16.0cs 3.16.0s 3.16.10s 3.16.1as 3.16.1s 3.16.2as 3.16.2bs 3.16.2s 3.16.3as 3.16.3s 3.16.4as 3.16.4bs 3.16.4cs 3.16.4ds 3.16.4es 3.16.4gs 3.16.4s 3.16.5as 3.16.5bs 3.16.5s 3.16.6bs 3.16.6s 3.16.7as 3.16.7bs 3.16.7s 3.16.8s 3.16.9s 3.17.0s 3.17.1as 3.17.1s 3.17.2s 3.17.3s 3.17.4s 3.18.0as 3.18.0s 3.18.0sp 3.18.1asp 3.18.1bsp 3.18.1csp 3.18.1gsp 3.18.1hsp 3.18.1isp 3.18.1s 3.18.1sp 3.18.2asp 3.18.2s 3.18.2sp 3.18.3asp 3.18.3bsp 3.18.3s 3.18.3sp 3.18.4s 3.18.4sp 3.18.5sp 3.18.6sp 3.18.7sp 3.18.8sp 3.2.0se 3.2.0sg 3.2.10sg 3.2.11sg 3.2.1se 3.2.1sg 3.2.2se 3.2.2sg 3.2.3se 3.2.3sg 3.2.4sg 3.2.5sg 3.2.6sg 3.2.7sg 3.2.8sg 3.2.9sg 3.3.0se 3.3.0sg 3.3.0sq 3.3.0xo 3.3.1se 3.3.1sg 3.3.1sq 3.3.1xo 3.3.2se 3.3.2sg 3.3.2xo 3.3.3se 3.3.4se 3.3.5se 3.4.0sg 3.4.0sq 3.4.1sg 3.4.1sq 3.4.2sg 3.4.3sg 3.4.4sg 3.4.5sg 3.4.6sg 3.4.7sg 3.4.8sg 3.5.0e 3.5.0sq 3.5.1e 3.5.1sq 3.5.2e 3.5.2sq 3.5.3e 3.5.3sq 3.5.4sq 3.5.5sq3.5.6sq3.5.7sq 3.5.8sq 3.6.0ae 3.6.0be 3.6.0e 3.6.10e 3.6.1e 3.6.2ae 3.6.3e 3.6.4e 3.6.5ae 3.6.5be 3.6.5e 3.6.6e 3.6.7ae 3.6.7be 3.6.7e 3.6.8e 3.6.9ae 3.6.9e 3.7.0bs 3.7.0e 3.7.0s 3.7.1as 3.7.1e 3.7.1s 3.7.2e 3.7.2s 3.7.2ts 3.7.3e 3.7.3s 3.7.4as 3.7.4e 3.7.4s 3.7.5e 3.7.5s 3.7.6s 3.7.7s 3.7.8s 3.8.0e 3.8.0s 3.8.1e 3.8.1s 3.8.2e 3.8.2s 3.8.3e 3.8.4e 3.8.5ae 3.8.5e 3.8.6e 3.8.7e 3.8.8e 3.8.9e 3.9.0as 3.9.0e 3.9.0s 3.9.1as 3.9.1e 3.9.1s 3.9.2be3.9.2e3.9.2s

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-digsig-bypass-FYQ3bmVq

References (1)

Vendor Advisoryx_refsource_CISCOPatch

Source: [email protected]

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-digsig-bypass-FYQ3bmVq

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.8MEDIUM[email protected]

Attack Vector: PHYSICAL
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-347

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