Buffer overflow in Cisco Systems, Inc products - CVE-2021-34727

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Main Vulnerability Database Vulnerabilities #VU56862

Buffer overflow in Cisco Systems, Inc products - CVE-2021-34727

Published: September 24, 2021


Vulnerability identifier: #VU56862
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-34727
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in the vDaemon process. A remote attacker can trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


Affected software

Cisco 1000 Series Integrated Services Routers
Cisco 4000 Series Integrated Services Routers
Cisco ASR 1000 Series Aggregation Services Routers
Cisco Cloud Services Router 1000V Series
Cisco IOS XE SD-WAN

How to mitigate CVE-2021-34727

Install updates from vendor's website.

Cisco IOS XE SD-WAN - addressed in versions 16.12(3.16), 16.12.4, 17.2(1.16), 17.2.2, 17.3(0.131), 17.3.1, 18.4.5, 18.4.6, 19.2.3, 19.2.4, 19.2.31, 20.1.2, 20.1.12, 20.3.1, 20.3.2, 20.3.2.1, 20.3.3, 20.3.3.1, 20.4.1, 20.4.1.1

External References

Related Security Bulletins