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CVE-2021-1510

Cisco SD-WAN vEdge Software Buffer Overflow Vulnerabilities

HIGH
7.5
CVSS Score
Published: May 6, 2021 at 12:42 PM UTC
Updated: June 17, 2026 at 03:31 AM UTC
17 products affected across 1 vendorVedge 2000 FirmwareVedge 1000 FirmwareVedge 100 Firmware

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Severity
HIGH7.5
Exploit prediction
EPSS 1%
SSVC
No known exploit

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

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

Vedge 100 Firmware· Cisco
95%
20.4 ≤ v < 20.4.120.5 ≤ v < 20.5.119.2.99
Affected range stops below 20.4.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.5.1, so it looks safe — our inference, not a vendor statement
cisco-vedge-100 (same device)
Vedge 1000 Firmware· Cisco
95%
20.4 ≤ v < 20.4.120.5 ≤ v < 20.5.119.2.99
Affected range stops below 20.4.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.5.1, so it looks safe — our inference, not a vendor statement
cisco-vedge-1000 (same device)
Vedge 100B Firmware· Cisco
95%
20.4 ≤ v < 20.4.120.5 ≤ v < 20.5.119.2.99
Affected range stops below 20.4.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.5.1, so it looks safe — our inference, not a vendor statement
cisco-vedge-100b (same device)
Vedge 100M Firmware· Cisco
95%
20.4 ≤ v < 20.4.120.5 ≤ v < 20.5.119.2.99
Affected range stops below 20.4.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.5.1, so it looks safe — our inference, not a vendor statement
cisco-vedge-100m (same device)
Vedge 100WM Firmware· Cisco
95%
20.4 ≤ v < 20.4.120.5 ≤ v < 20.5.119.2.99
Affected range stops below 20.4.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.5.1, so it looks safe — our inference, not a vendor statement
cisco-vedge-100wm (same device)
Vedge 2000 Firmware· Cisco
95%
20.4 ≤ v < 20.4.120.5 ≤ v < 20.5.119.2.99
Affected range stops below 20.4.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.5.1, so it looks safe — our inference, not a vendor statement
cisco-vedge-2000 (same device)
Vedge 5000 Firmware· Cisco
95%
20.4 ≤ v < 20.4.120.5 ≤ v < 20.5.119.2.99
Affected range stops below 20.4.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.5.1, so it looks safe — our inference, not a vendor statement
cisco-vedge-5000 (same device)
Vedge Cloud Firmware· Cisco
95%
20.4 ≤ v < 20.4.120.5 ≤ v < 20.5.119.2.99
Affected range stops below 20.4.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.5.1, so it looks safe — our inference, not a vendor statement
cisco-vedge-cloud (same device)
SD-WAN vEdge Router· Cisco
60%
All versions
Vedge 100· Ciscodevice
80%
All versions

Remediation

No guide yet

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

Patch and advisory references

References (1)

Vendor Advisoryx_refsource_CISCO
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-buffover-MWGucjtO

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

7.5HIGHcisco
Attack Vector
NETWORK
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-119

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