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Fencer Intel
high 8.1

CVE-2020-3297 json

Cisco Small Business Smart and Managed Switches Session Management Vulnerability

published 6y ago modified 4mo ago also EUVD-2020-24568

cvss
8.1
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.0%
EPSS 3.0% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

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.

Patch / fix

  • 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
  • cisco sg250-26_firmware 2.5.5.47
  • cisco sg250-26hp_firmware 2.5.5.47
  • cisco sg250-26p_firmware 2.5.5.47
  • cisco sg250-50_firmware 2.5.5.47
  • cisco sg250-50hp_firmware 2.5.5.47
  • cisco sg250-50p_firmware 2.5.5.47
  • cisco sf250-24_firmware 2.5.5.47
  • cisco sf250-24p_firmware 2.5.5.47
  • cisco sf250-48_firmware 2.5.5.47
  • cisco sf250-48hp_firmware 2.5.5.47
  • cisco sg350-10_firmware 2.5.5.47
  • cisco sg350-10p_firmware 2.5.5.47

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
last yr.

Exploit prediction

3.04% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.0 8.1 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • Cisco Cisco Small Business 200 Series Smart Switches

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.