The vulnerability of the SISF security function in Cisco IOS and Cisco IOS XE operating systems allows a hacker to trigger a service failure.

🗓️ 27 Aug 2025 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType

bdu_fstec

bdu_fstec🔗 bdu.fstec.ru👁 1 Views

The vulnerability of the SISF security function in Cisco IOS and Cisco IOS XE operating systems is related to the execution of operations outside the buffer in memory. Exploiting this vulnerability can allow a malicious actor to cause service fail...

Reporter	Title	Published	Views	Family All 10
Circl	CVE-2025-20191	7 May 202521:48	–	circl
Cisco	Multiple Cisco Products Switch Integrated Security Features DHCPv6 Denial of Service Vulnerability	7 May 202516:00	–	cisco
CNNVD	Cisco多款产品安全漏洞	7 May 202500:00	–	cnnvd
CVE	CVE-2025-20191	7 May 202517:18	–	cve
Cvelist	CVE-2025-20191 Multiple Cisco Products Denial of Service Vulnerability	7 May 202517:18	–	cvelist
EUVD	EUVD-2025-13915	3 Oct 202520:07	–	euvd
NVD	CVE-2025-20191	7 May 202518:15	–	nvd
Positive Technologies	PT-2025-20263	7 May 202500:00	–	ptsecurity
RedhatCVE	CVE-2025-20191	9 May 202518:08	–	redhatcve
Vulnrichment	CVE-2025-20191 Multiple Cisco Products Denial of Service Vulnerability	7 May 202517:18	–	vulnrichment

Vulners

Node

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Source	Link
sec	www.sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sisf-dos-ZGwt4DdY
web	www.web.nvd.nist.gov/view/vuln/detail

27 Aug 2025 00:00Current

6Medium risk

Vulners AI Score6

CVSS 26.1

CVSS 37.4

EPSS0.00199