CVE-2021-34711

lowpriority · track · 22EPSS 0.003 · 18 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.27% (18th) EPSS

CVSS 2.1 · low

Is it mine?

24 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · scored 2026-10-27

A vulnerability in the debug shell of Cisco IP Phone software could allow an authenticated, local attacker to read any file on the device file system. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by providing crafted input to a debug shell command. A successful exploit could allow the attacker to read any file on the device file system.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedCisco IP Phones with Multiplatform Firmwarecisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Session Initiation Protocol (SIP) Softwarecisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com

cvss

Technical severity, 0–10. One row per scoring source.

5.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.1–5.5

v2.02.1lowAV:L/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 2.9

v3.15.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 1.8 · impact 3.6

v3.15.5mediumAV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nsecondary · FSTEC (BDU) RU

v3.15.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nsecondary · ENISA EU

v3.15.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nsecondary · psirt@cisco.com USexploitability 1.8 · impact 3.6

v3.15.1mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.15.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nsecondary · Cisco PSIRT US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-22USprimaryCWE-22USCWE-36USCWE-36US

affected products (24)

Products and version ranges known to be affected.

Cisco Cisco IP Phones with Multiplatform Firmwareall versionscisco_csafUS
Cisco Cisco Session Initiation Protocol (SIP) Softwareall versionscisco_csafUS
Cisco Cisco IP Phones with Multiplatform Firmware≤ n/aenisa_euvdEU
Cisco Systems Inc. Cisco IP Conference Phone 783214.0 → 14.0(1)SR2fstec_bduRU
Cisco Systems Inc. Cisco IP Conference Phone 883214.0 → 14.0(1)SR2fstec_bduRU
Cisco Systems Inc. Cisco IP Phone 780014.0 → 14.0(1)SR2fstec_bduRU
Cisco Systems Inc. Cisco IP Phone 880014.0 → 14.0(1)SR2fstec_bduRU
Cisco Systems Inc. Cisco IP Phone 882111.0 → 11.0(6)Sr2fstec_bduRU
cisco ip conference phone 7832 firmware< 14.1\(1\)nvdUScpe:2.3:o:cisco:ip_conference_phone_7832_firmware:*:*:*:*:*:*:*:*
cisco ip conference phone 8832 firmware< 14.1\(1\)nvdUScpe:2.3:o:cisco:ip_conference_phone_8832_firmware:*:*:*:*:*:*:*:*
cisco ip phone 7811 firmware< 14.1\(1\)nvdUScpe:2.3:o:cisco:ip_phone_7811_firmware:*:*:*:*:*:*:*:*
cisco ip phone 7821 firmware< 14.1\(1\)nvdUScpe:2.3:o:cisco:ip_phone_7821_firmware:*:*:*:*:*:*:*:*
cisco ip phone 7832 firmware< 14.1\(1\)nvdUScpe:2.3:o:cisco:ip_phone_7832_firmware:*:*:*:*:*:*:*:*
cisco ip phone 7841 firmware< 14.1\(1\)nvdUScpe:2.3:o:cisco:ip_phone_7841_firmware:*:*:*:*:*:*:*:*
cisco ip phone 7861 firmware< 14.1\(1\)nvdUScpe:2.3:o:cisco:ip_phone_7861_firmware:*:*:*:*:*:*:*:*
cisco ip phone 8811 firmware< 14.1\(1\)nvdUScpe:2.3:o:cisco:ip_phone_8811_firmware:*:*:*:*:*:*:*:*
cisco ip phone 8831 firmware< 14.1\(1\)nvdUScpe:2.3:o:cisco:ip_phone_8831_firmware:*:*:*:*:*:*:*:*
cisco ip phone 8841 firmware< 14.1\(1\)nvdUScpe:2.3:o:cisco:ip_phone_8841_firmware:*:*:*:*:*:*:*:*
cisco ip phone 8845 firmware< 14.1\(1\)nvdUScpe:2.3:o:cisco:ip_phone_8845_firmware:*:*:*:*:*:*:*:*
cisco ip phone 8851 firmware< 14.1\(1\)nvdUScpe:2.3:o:cisco:ip_phone_8851_firmware:*:*:*:*:*:*:*:*

showing 20 of 24

advisories (1)

Vendor and ecosystem advisories describing this.

cisco-sa-ipphone-arbfileread-NPdtE2OwCisco IP Phone Software Arbitrary File Read Vulnerability2021-10-06csaf · cisco_csafUS
A vulnerability in the debug shell of Cisco IP Phone software could allow an authenticated, local attacker to read any file on the device file system. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by providing crafted input to a debug shell command. A successful exploit could allow the attacker to read any file on the device file system. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisco_csaf nvd NVD CVE.org MITRE

published 2021-10-06modified 2026-06-17

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+12523 more

references (7)

External citations — patches, advisories, analysis.

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