Cisco IP Phone Software Arbitrary File Read Vulnerability
Priority LOW 24CWE-36Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-22 and the CVSS impact.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00266 18th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Cisco | Cisco IP Phones with Multiplatform Firmware | all versions | — | No fix listed | CNA |
- Cisco IP Phones with Multiplatform Firmware VendorCisco Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 32
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ip_conference_phone_7832_firmware:*:*:*:*:*:*:*:* | before 14.1\(1\) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_conference_phone_7832:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_conference_phone_8832_firmware:*:*:*:*:*:*:*:* | before 14.1\(1\) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_conference_phone_8832:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_7811_firmware:*:*:*:*:*:*:*:* | before 14.1\(1\) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_7811:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_7821_firmware:*:*:*:*:*:*:*:* | before 14.1\(1\) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_7821:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_7832_firmware:*:*:*:*:*:*:*:* | before 14.1\(1\) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_7832:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:ip_conference_phone_7832_firmware:*:*:*:*:*:*:*:* Versions before 14.1\(1\) Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_conference_phone_7832:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_conference_phone_8832_firmware:*:*:*:*:*:*:*:* Versions before 14.1\(1\) Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_conference_phone_8832:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_7811_firmware:*:*:*:*:*:*:*:* Versions before 14.1\(1\) Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_7811:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_7821_firmware:*:*:*:*:*:*:*:* Versions before 14.1\(1\) Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_7821:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_7832_firmware:*:*:*:*:*:*:*:* Versions before 14.1\(1\) Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_7832:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Show 22 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ip_phone_7841_firmware:*:*:*:*:*:*:*:* | before 14.1\(1\) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_7841:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_7861_firmware:*:*:*:*:*:*:*:* | before 14.1\(1\) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_7861:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_8811_firmware:*:*:*:*:*:*:*:* | before 14.1\(1\) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_8811:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_8831_firmware:*:*:*:*:*:*:*:* | before 14.1\(1\) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_8831:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phones_8832_firmware:*:*:*:*:*:*:*:* | before 14.1\(1\) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phones_8832:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_8841_firmware:*:*:*:*:*:*:*:* | before 14.1\(1\) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_8841:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_8845_firmware:*:*:*:*:*:*:*:* | before 14.1\(1\) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_8845:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_8851_firmware:*:*:*:*:*:*:*:* | before 14.1\(1\) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_8851:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_8861_firmware:*:*:*:*:*:*:*:* | before 14.1\(1\) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_8861:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_8865_firmware:*:*:*:*:*:*:*:* | before 14.1\(1\) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_8865:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:wireless_ip_phone_8821_firmware:*:*:*:*:*:*:*:* | before 11.0\(6\)sr2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:wireless_ip_phone_8821:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:ip_phone_7841_firmware:*:*:*:*:*:*:*:* Versions before 14.1\(1\) Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_7841:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_7861_firmware:*:*:*:*:*:*:*:* Versions before 14.1\(1\) Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_7861:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_8811_firmware:*:*:*:*:*:*:*:* Versions before 14.1\(1\) Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_8811:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_8831_firmware:*:*:*:*:*:*:*:* Versions before 14.1\(1\) Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_8831:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phones_8832_firmware:*:*:*:*:*:*:*:* Versions before 14.1\(1\) Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phones_8832:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_8841_firmware:*:*:*:*:*:*:*:* Versions before 14.1\(1\) Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_8841:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_8845_firmware:*:*:*:*:*:*:*:* Versions before 14.1\(1\) Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_8845:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_8851_firmware:*:*:*:*:*:*:*:* Versions before 14.1\(1\) Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_8851:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_8861_firmware:*:*:*:*:*:*:*:* Versions before 14.1\(1\) Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_8861:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_8865_firmware:*:*:*:*:*:*:*:* Versions before 14.1\(1\) Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_8865:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:wireless_ip_phone_8821_firmware:*:*:*:*:*:*:*:* Versions before 11.0\(6\)sr2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:wireless_ip_phone_8821:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-34711
- 2026-10-03 Alias added: GHSA-rh9c-8fw7-2j3p
References
More Cisco Ip Conference Phone 7832 Firmware vulnerabilities
- TI-2020-02673 Cisco IP Phone Remote Code Execution and Denial of Service Vulnerability CVSS 3.1HIGH 8.8
- TI-2019-01261 Cisco IP Phone 7800 Series and 8800 Series Session Initiation Protocol XML Denial of Service Vulnerability CVSS 3.1HIGH 7.5
- TI-2019-01542 Cisco IP Phone 7800 and 8800 Series Session Initiation Protocol Denial of Service Vulnerability CVSS 3.0HIGH 7.5
- TI-2024-13373 Cisco IP Phone 7800, 8800, and 9800 Series Information Disclosure Vulnerability CVSS 3.1MEDIUM 5.3
- TI-2019-01310 Resource management flaw in Cisco IP Phone 8800 Series Software CVSS 3.1MEDIUM 6.5
- TI-2021-01106 Buffer overflow in Cisco IP Phones with Multiplatform Firmware CVSS 3.1MEDIUM 6.5
Sources
- CVE-2021-34711 · CVE Program
- CVE-2021-34711 · NVD
- FIRST EPSS
- GHSA-rh9c-8fw7-2j3p · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences