CVE-2025-20350A vulnerability in the web UI of Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 running Cisco SIP Software could allow an unauthenticated, remote attack…
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It affects cisco desk_phone_9871_firmware and 16 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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A vulnerability in the web UI of Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 running Cisco SIP Software could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to a buffer overflow when an affected device processes HTTP packets. An attacker could exploit this vulnerability by sending crafted HTTP input to the device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. Note: To exploit this vulnerability, the phone must be registered to Cisco Unified Communications Manager and have Web Access enabled. Web Access is disabled by default.
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-121
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
cisco desk_phone_9871_firmware cisco:desk_phone_9871_firmware | from 3.0\(1\) through 3.2\(1\) | NVD |
cisco desk_phone_9841_firmware cisco:desk_phone_9841_firmware | from 3.0\(1\) through 3.2\(1\) | NVD |
cisco desk_phone_9851_firmware cisco:desk_phone_9851_firmware | from 3.0\(1\) through 3.2\(1\) | NVD |
cisco desk_phone_9861_firmware cisco:desk_phone_9861_firmware | from 3.0\(1\) through 3.2\(1\) | NVD |
cisco ip_phone_8865_firmware cisco:ip_phone_8865_firmware | before 14.3\(1\); 14.3(1); 14.3(1) | NVD |
cisco ip_phone_7811_firmware cisco:ip_phone_7811_firmware | before 14.3\(1\); 14.3(1); 14.3(1) | NVD |
cisco ip_phone_7821_firmware cisco:ip_phone_7821_firmware | before 14.3\(1\); 14.3(1); 14.3(1) | NVD |
cisco ip_phone_7841_firmware cisco:ip_phone_7841_firmware | before 14.3\(1\); 14.3(1); 14.3(1) | NVD |
cisco ip_phone_7861_firmware cisco:ip_phone_7861_firmware | before 14.3\(1\); 14.3(1); 14.3(1) | NVD |
cisco ip_phone_8811_firmware cisco:ip_phone_8811_firmware | before 14.3\(1\); 14.3(1); 14.3(1) | NVD |
cisco ip_phone_8832_firmware cisco:ip_phone_8832_firmware | before 14.3\(1\); 14.3(1); 14.3(1) | NVD |
cisco ip_phone_8841_firmware cisco:ip_phone_8841_firmware | before 14.3\(1\); 14.3(1); 14.3(1) | NVD |
cisco ip_phone_8845_firmware cisco:ip_phone_8845_firmware | before 14.3\(1\); 14.3(1); 14.3(1) | NVD |
cisco ip_phone_8851_firmware cisco:ip_phone_8851_firmware | before 14.3\(1\); 14.3(1); 14.3(1) | NVD |
cisco ip_phone_8861_firmware cisco:ip_phone_8861_firmware | before 14.3\(1\); 14.3(1); 14.3(1) | NVD |
cisco video_phone_8875_firmware cisco:video_phone_8875_firmware | before 2.3\(1\); from 3.0\(1\) through 3.2\(1\); 2.3(1); 2.3(1) | NVD |
cisco ip_phone_8821_firmware cisco:ip_phone_8821_firmware | before 11.0\(1\); 11.0(0.7); 11.0(1); 11.0(2); 11.0(2); 11.0(2); 11.0(3); 11.0(3); and 19 more ranges | NVD |
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-phone-dos-FPyjLV7Avendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.