CVE-2021-34711
Cisco IP Phone Software Arbitrary File Read Vulnerability
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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Cisco IP Phone Software Arbitrary File Read Vulnerability
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.
- Record
CVE-2021-34711- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-36
- Updated
- 2026-11-02
EUVDEUVD-2021-21361
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.
- Record
EUVD-2021-21361- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-rh9c-8fw7-2j3p No score
A vulnerability in the debug shell of Cisco IP Phone software could allow an authenticated, local...
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.
- Record
GHSA-rh9c-8fw7-2j3p- Weakness
- CWE-22
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2021-34711- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 2.1 Low
AV:L/AC:L/Au:N/C:P/I:N/A:N - Weakness
- CWE-36, CWE-22
- Updated
- 2026-11-02
Affected products
- cisco ip phones with multiplatform firmware
- cisco ip conference phone 7832 firmware
- cisco ip conference phone 8832 firmware
- cisco ip phone 7811 firmware
- cisco ip phone 7821 firmware
- cisco ip phone 7832 firmware
- cisco ip phone 7841 firmware
- cisco ip phone 7861 firmware
- cisco ip phone 8811 firmware
- cisco ip phone 8831 firmware
- cisco ip phone 8841 firmware
- cisco ip phone 8845 firmware
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-34711 is a medium vulnerability (CVSS 5.5) in Cisco Ip Phones With Multiplatform Firmware, published October 6, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.27%, the 18th percentile. No source names a fixed version.