CVE-2021-1510Network attack vector

Unauthenticated reboot via packet-mirroring bounds failure

Published May 6, 2021 · Updated Nov 8, 2024

Buffer overflow in Cisco SD-WAN vEdge Software allows remote attackers to reboot affected routers via malicious transit traffic. The packet mirroring feature processes traffic without sufficient bounds checking, allowing crafted packets to overrun a buffer. No authentication or user interaction is required, but the traffic must pass through the device; successful exploitation reloads it and interrupts routing.

CVSS severity7.5
High
EPSS probability1.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Cisco SD-WAN vEdge Software allows remote attackers to reboot affected routers via malicious transit traffic. The packet mirroring feature processes traffic without sufficient bounds checking, allowing crafted packets to overrun a buffer. No authentication or user interaction is required, but the traffic must pass through the device; successful exploitation reloads it and interrupts routing.

The record

CVE
CVE-2021-1510
Published
May 6, 2021
Updated
Nov 8, 2024
Vendor
ClamAV
Product
Cisco SD-WAN vEdge Router
Classifications
CWE-119, T1498
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 2021CVE publishedPublication date reported by the CVE source.
  2. Nov 8, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco SD-WAN vEdge Routerversion=n/a

Published CVSS scores

5.0NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1498Network Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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