CVE-2021-34724

Root code execution via overwritten installer file

Published Sep 23, 2021 · Updated Nov 7, 2024

Privilege escalation in Cisco IOS XE SD-WAN Software allows local users with PRIV15 access to execute arbitrary code as root. Insufficient bootflash protection lets a PRIV15 user replace a sensitive installer file with commands that subsequently execute at root privilege. Exposure requires the nondefault SD-WAN feature; successful exploitation permits reading and writing the device configuration database.

CVSS severity6.0
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in Cisco IOS XE SD-WAN Software allows local users with PRIV15 access to execute arbitrary code as root. Insufficient bootflash protection lets a PRIV15 user replace a sensitive installer file with commands that subsequently execute at root privilege. Exposure requires the nondefault SD-WAN feature; successful exploitation permits reading and writing the device configuration database.

The record

CVE
CVE-2021-34724
Published
Sep 23, 2021
Updated
Nov 7, 2024
Vendor
ClamAV
Product
Cisco IOS XE SD-WAN Software
Classifications
CWE-284, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 23, 2021CVE publishedPublication date reported by the CVE source.
  2. Nov 7, 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 vectorlocal
Required privilegesadmin

What is affected?

ClamAV · Cisco IOS XE SD-WAN Softwareversion=n/a

Published CVSS scores

6.0Cisco Systems, Inc.CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N/E:X/RL:X/RC:X
6.6NIST NVDAV:L/AC:L/Au:N/C:C/I:C/A:N

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1068Exploitation for Privilege Escalation

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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