The vulnerability of the microprogramming software in Cisco SIP IP phones such as Cisco Video Phone 8875, Desk Phone 9800, and IP Phones series 7800 and 8800 relates to the ability to disclose information, allowing unauthorized access to confidential data.

🗓️ 13 Feb 2026 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType

bdu_fstec

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Cisco SIP IP phone microprogramming flaw may disclose confidential data to unauthorized access.

Reporter	Title	Published	Views	Family All 11
Cisco	Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Vulnerabilities	3 Sep 202516:00	–	cisco
Tenable Nessus	Cisco Desk/IP/Video Phone Multiple Vulnerabilities (cisco-sa-phone-write-g3kcC5Df)	12 Sep 202500:00	–	nessus
Tenable Nessus	Cisco IP Phones Exposure of Sensitive Information to an Unauthorized Actor (CVE-2025-20336)	20 Jan 202600:00	–	nessus
CNNVD	Cisco多款产品信息泄露漏洞	3 Sep 202500:00	–	cnnvd
CVE	CVE-2025-20336	3 Sep 202517:41	–	cve
Cvelist	CVE-2025-20336 Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Firmware Information Disclosure Vulnerability	3 Sep 202517:41	–	cvelist
EUVD	EUVD-2025-26613	5 Jan 202615:32	–	euvd
NVD	CVE-2025-20336	3 Sep 202518:15	–	nvd
Positive Technologies	PT-2025-35814	3 Sep 202500:00	–	ptsecurity
RedhatCVE	CVE-2025-20336	5 Sep 202518:18	–	redhatcve

Vulners

Node

cisco_systems cisco_ip_phone_7800Range≤14.3

OR

cisco_systems cisco_ip_phone_8800Range≤14.3

OR

cisco_systems cisco_ip_phone_8821Range≤11

Source	Link
sec	www.sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-phone-write-g3kcC5Df
web	www.web.nvd.nist.gov/view/vuln/detail
cisco	www.cisco.com/c/en/us/support/docs/csa/cisco-sa-phone-write-g3kcC5Df.html

13 Feb 2026 00:00Current

5.8Medium risk

Vulners AI Score5.8

CVSS 25

CVSS 35.3

EPSS0.00349

Cisco video phone Desk phone Phone 8875 Phone 9800 Phone 7800 Phone 8800