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Fencer Vulns
high 7.2

CVE-2021-1571 json

Cisco Small Business 220 Series Smart Switches Vulnerabilities

published 2021-06-16 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-7038

cvss
7.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
9.7%
EPSS 9.7% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

Multiple vulnerabilities in the web-based management interface of Cisco Small Business 220 Series Smart Switches could allow an attacker to do the following: Hijack a user session Execute arbitrary commands as a root user on the underlying operating system Conduct a cross-site scripting (XSS) attack Conduct an HTML injection attack For more information about these vulnerabilities, see the Details section of this advisory.

Patch / fix

  • cisco sf220-24_firmware 1.2.0.6
  • cisco sf220-24p_firmware 1.2.0.6
  • cisco sf220-48_firmware 1.2.0.6
  • cisco sf220-48p_firmware 1.2.0.6
  • cisco sg220-26_firmware 1.2.0.6
  • cisco sg220-26p_firmware 1.2.0.6
  • cisco sg220-28mp_firmware 1.2.0.6
  • cisco sg220-50_firmware 1.2.0.6
  • cisco sg220-50p_firmware 1.2.0.6

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

9.72% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.2 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

  • Cisco Cisco Small Business 220 Series Smart Plus Switches

Classification

Weakness
  • CWE-287 Improper Authentication
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns 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.