CVE-2021-1511: Cisco SD-WAN vEdge Software Buffer Overflow Vulnerabilities

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-05-06 · updated 2026-06-17
Weakness: CWE-119

Description

Multiple vulnerabilities in Cisco SD-WAN vEdge Software could allow an attacker to execute arbitrary code as the root user or cause a denial of service (DoS) condition on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.

Affected products

Cisco Vedge 1000 Firmware: from 20.4 before 20.4.1; from 20.5 before 20.5.1; 19.2.99 — fixed in 20.4.1, 20.5.1
Cisco Vedge 100 Firmware: from 20.4 before 20.4.1; from 20.5 before 20.5.1; 19.2.99 — fixed in 20.4.1, 20.5.1
Cisco Vedge 100B Firmware: from 20.4 before 20.4.1; from 20.5 before 20.5.1; 19.2.99 — fixed in 20.4.1, 20.5.1
Cisco Vedge 100M Firmware: from 20.4 before 20.4.1; from 20.5 before 20.5.1; 19.2.99 — fixed in 20.4.1, 20.5.1
Cisco Vedge 100Wm Firmware: from 20.4 before 20.4.1; from 20.5 before 20.5.1; 19.2.99 — fixed in 20.4.1, 20.5.1
Cisco Vedge 2000 Firmware: from 20.4 before 20.4.1; from 20.5 before 20.5.1; 19.2.99 — fixed in 20.4.1, 20.5.1
Cisco Vedge 5000 Firmware: from 20.4 before 20.4.1; from 20.5 before 20.5.1; 19.2.99 — fixed in 20.4.1, 20.5.1
Cisco Vedge Cloud Firmware: from 20.4 before 20.4.1; from 20.5 before 20.5.1; 19.2.99 — fixed in 20.4.1, 20.5.1

How to fix

Upgrade to a fixed version: Cisco Vedge 1000 Firmware 20.4.1, 20.5.1; Cisco Vedge 100 Firmware 20.4.1, 20.5.1; Cisco Vedge 100B Firmware 20.4.1, 20.5.1; Cisco Vedge 100M Firmware 20.4.1, 20.5.1; Cisco Vedge 100Wm Firmware 20.4.1, 20.5.1; Cisco Vedge 2000 Firmware 20.4.1, 20.5.1; Cisco Vedge 5000 Firmware 20.4.1, 20.5.1; Cisco Vedge Cloud Firmware 20.4.1, 20.5.1. Check the vendor advisory for mitigations.

References

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