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CVE-2021-34711

Cisco IP Phone Software Arbitrary File Read Vulnerability

MEDIUM
5.5
CVSS Score
Published: October 6, 2021 at 07:46 PM UTC
Updated: June 17, 2026 at 03:56 AM UTC
33 products affected across 1 vendorIP Phone 8861 FirmwareIP Phone 8865 FirmwareIP Phone 8811 Firmware

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

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.

Affected

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

IP Conference Phone 7832 Firmware· Cisco
95%
v < 14.1(1)
Affected range stops below 14.1(1), so it looks safe — our inference, not a vendor statement
cisco-ip-conference-phone-7832 (same device)
IP Conference Phone 8832 Firmware· Cisco
95%
v < 14.1(1)
Affected range stops below 14.1(1), so it looks safe — our inference, not a vendor statement
cisco-ip-conference-phone-8832 (same device)
IP Phone 7811 Firmware· Cisco
95%
v < 14.1(1)
Affected range stops below 14.1(1), so it looks safe — our inference, not a vendor statement
cisco-ip-phone-7811 (same device)
IP Phone 7821 Firmware· Cisco
95%
v < 14.1(1)
Affected range stops below 14.1(1), so it looks safe — our inference, not a vendor statement
cisco-ip-phone-7821 (same device)
IP Phone 7832 Firmware· Cisco
95%
v < 14.1(1)
Affected range stops below 14.1(1), so it looks safe — our inference, not a vendor statement
cisco-ip-phone-7832 (same device)
IP Phone 7841 Firmware· Cisco
95%
v < 14.1(1)
Affected range stops below 14.1(1), so it looks safe — our inference, not a vendor statement
cisco-ip-phone-7841 (same device)
IP Phone 7861 Firmware· Cisco
95%
v < 14.1(1)
Affected range stops below 14.1(1), so it looks safe — our inference, not a vendor statement
cisco-ip-phone-7861 (same device)
IP Phone 8811 Firmware· Cisco
95%
v < 14.1(1)
Affected range stops below 14.1(1), so it looks safe — our inference, not a vendor statement
cisco-ip-phone-8811 (same device)
IP Phone 8831 Firmware· Cisco
95%
v < 14.1(1)
Affected range stops below 14.1(1), so it looks safe — our inference, not a vendor statement
cisco-ip-phone-8831 (same device)
IP Phone 8841 Firmware· Cisco
95%
v < 14.1(1)
Affected range stops below 14.1(1), so it looks safe — our inference, not a vendor statement
cisco-ip-phone-8841 (same device)

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-ipphone-arbfileread-NPdtE2Ow

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

5.5MEDIUMcisco
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-36CWE-22

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