CVE-2021-34771

Sensitive configuration disclosure via unrestricted CLI command

Published Sep 9, 2021 · Updated Nov 7, 2024

Information disclosure in the Cisco IOS XR Software CLI before 7.3.2 allows local users to view restricted configuration data. The CLI incompletely applies privilege restrictions while executing a specific command, so its output includes otherwise inaccessible details. An authenticated local account is required; Cisco has not disclosed the command, and no configuration change or service interruption is reported.

CVSS severity5.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the Cisco IOS XR Software CLI before 7.3.2 allows local users to view restricted configuration data. The CLI incompletely applies privilege restrictions while executing a specific command, so its output includes otherwise inaccessible details. An authenticated local account is required; Cisco has not disclosed the command, and no configuration change or service interruption is reported.

The record

CVE
CVE-2021-34771
Published
Sep 9, 2021
Updated
Nov 7, 2024
Vendor
ClamAV
Product
Cisco IOS XR Software
Classifications
CWE-201, T1602.002
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 9, 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 privilegesauthenticated

What is affected?

ClamAV · Cisco IOS XR Softwareversion=n/a

Published CVSS scores

2.1NISTAV:L/AC:L/Au:N/C:P/I:N/A:N
5.5Cisco Systems, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:X/RL:X/RC:X

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

Weakness, pattern, technique

CWE-201Insertion of Sensitive Information Into Sent Data
T1602.002Network Device Configuration Dump

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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