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CVE-2021-34739

HIGHCVSS 8.1/10EPSS 1.62%

Last modified

CVE-2021-34739 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. A vulnerability in the web-based management interface of multiple Cisco Small Business Series Switches could allow an unauthenticated, remote attacker to replay valid user session credentials and gain unauthorized access to the web-based management interface of an affected device. This vulnerability is due to insufficient expiration of session credentials. EPSS estimates a 1.62% chance of exploitation in the next 30 days.

Description

A vulnerability in the web-based management interface of multiple Cisco Small Business Series Switches could allow an unauthenticated, remote attacker to replay valid user session credentials and gain unauthorized access to the web-based management interface of an affected device. This vulnerability is due to insufficient expiration of session credentials. An attacker could exploit this vulnerability by conducting a man-in-the-middle attack against an affected device to intercept valid session credentials and then replaying the intercepted credentials toward the same device at a later time. A successful exploit could allow the attacker to access the web-based management interface with administrator privileges.

Metrics

CVSS 3.1
8.1/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
1.62%

73.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoSf250-24 Firmware<= 2.5
CiscoSf250-24p Firmware<= 2.5
CiscoSf250-48 Firmware<= 2.5
CiscoSf250-48hp Firmware<= 2.5
CiscoSf250-08 Firmware<= 2.5
CiscoSf250-08hp Firmware<= 2.5
CiscoSf250-10p Firmware<= 2.5
CiscoSf250-18 Firmware<= 2.5
CiscoSf250-26 Firmware<= 2.5
CiscoSf250-26hp Firmware<= 2.5
CiscoSf250-26p Firmware<= 2.5
CiscoSf250-50 Firmware<= 2.5
CiscoSf250-50hp Firmware<= 2.5
CiscoSf250-50p Firmware<= 2.5
CiscoSf250x-24 Firmware<= 2.5
CiscoSf250x-24p Firmware<= 2.5
CiscoSf250x-48 Firmware<= 2.5
CiscoSf250x-48p Firmware<= 2.5
CiscoSf350-08 Firmware<= 2.5
CiscoSf350-24 Firmware<= 2.5
CiscoSf350-24mp Firmware<= 2.5
CiscoSf350-24p Firmware<= 2.5
CiscoSf350-48 Firmware<= 2.5
CiscoSf350-8mp Firmware<= 2.5
CiscoSf350-48p Firmware<= 2.5
CiscoSf352-08 Firmware<= 2.5
CiscoSf352-08mp Firmware<= 2.5
CiscoSf352-08p Firmware<= 2.5
CiscoSf350-8pd Firmware<= 2.5
CiscoSf350-10 Firmware<= 2.5
CiscoSf350-10mp Firmware<= 2.5
CiscoSf350-10p Firmware<= 2.5
CiscoSf350-10sfp Firmware<= 2.5
CiscoSf350-20 Firmware<= 2.5
CiscoSf350-28 Firmware<= 2.5
CiscoSf350-28mp Firmware<= 2.5
CiscoSf350-28p Firmware<= 2.5
CiscoSf350-28sfp Firmware<= 2.5
CiscoSf350-52 Firmware<= 2.5
CiscoSf350-52mp Firmware<= 2.5
CiscoSf350-52p Firmware<= 2.5
CiscoSf355-10p Firmware<= 2.5
CiscoSg350x-8pmd Firmware<= 2.5
CiscoSg350x-12pmv Firmware<= 2.5
CiscoSg350x-24 Firmware<= 2.5
CiscoSg350x-24p Firmware<= 2.5
CiscoSg350x-24mp Firmware<= 2.5
CiscoSg350x-24pd Firmware<= 2.5
CiscoSg350x-24pv Firmware<= 2.5
CiscoSg350x-48 Firmware<= 2.5

Showing 50 of 209 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-34739?
A vulnerability in the web-based management interface of multiple Cisco Small Business Series Switches could allow an unauthenticated, remote attacker to replay valid user session credentials and gain unauthorized access to the web-based management interface of an affected device. This vulnerability is due to insufficient expiration of session credentials. An attacker could exploit this vulnerability by conducting a man-in-the-middle attack against an affected device to intercept valid session credentials and then replaying the intercepted credentials toward the same device at a later time. A successful exploit could allow the attacker to access the web-based management interface with administrator privileges.
How severe is CVE-2021-34739?
CVE-2021-34739 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 1.62% probability of exploitation in the next 30 days.
How do I fix CVE-2021-34739?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-34739?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST