CVE-2020-3297

9.8 CRITICAL 3% exploit odds Fix listed Auth & access Network gear

What it is

A vulnerability in session management for the web-based interface of Cisco Small Business Smart and Managed Switches could allow an unauthenticated, remote attacker to defeat authentication protections and gain unauthorized access to the management interface. The attacker could obtain the privileges of the highjacked session account, which could include administrator privileges on the device. The vulnerability is due to the use of weak entropy generation for session identifier values. An attacker could exploit this vulnerability to determine a current session identifier through brute force and reuse that session identifier to take over an ongoing session. In this way, an attacker could take actions within the management interface with privileges up to the level of the administrative user.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
Exploit odds: 3.0% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2020-07-02 05:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:17 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 3.0% in the next 30 days (EPSS).
Severity: 9.8 CRITICAL (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2020-07-02 05:15 UTC
Last modified: 2026-06-17 03:17 UTC
Exploit probability: 3.0% · EPSS, next 30 days
Weakness: CWE-287 · Improper authentication
Record status: Modified

Affected

Cisco sg250x-24 Firmware < 2.5.5.47
Cisco sg250x-24p Firmware < 2.5.5.47
Cisco sg250x-48 Firmware < 2.5.5.47
Cisco sg250x-48p Firmware < 2.5.5.47
Cisco sg250-08 Firmware < 2.5.5.47
Cisco sg250-08hp Firmware < 2.5.5.47
Cisco sg250-10p Firmware < 2.5.5.47
Cisco sg250-18 Firmware < 2.5.5.47

Attack profile CVSS 3.1 · 9.8

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

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

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record