Skip to content
Fencer Vulns
high 7.8

CVE-2021-1528 json

Cisco SD-WAN Software Privilege Escalation Vulnerability

published 2021-06-04 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-6995

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 16%
public exploits
0
none known

Summary

A vulnerability in the CLI of Cisco SD-WAN Software could allow an authenticated, local attacker to gain elevated privileges on an affected system. This vulnerability exists because the affected software does not properly restrict access to privileged processes. An attacker could exploit this vulnerability by invoking a privileged process in the affected system. A successful exploit could allow the attacker to perform actions with the privileges of the root user.

Patch / fix

  • cisco catalyst_sd-wan_manager 20.4.2, 20.5.1
  • cisco sd-wan_vbond_orchestrator 20.4.2, 20.5.1
  • cisco vsmart_controller 20.4.2, 20.5.1
  • cisco vedge_100_firmware 20.4.2, 20.5.1
  • cisco vedge_1000_firmware 20.4.2, 20.5.1
  • cisco vedge_100b_firmware 20.4.2, 20.5.1
  • cisco vedge_100m_firmware 20.4.2, 20.5.1
  • cisco vedge_100wm_firmware 20.4.2, 20.5.1
  • cisco vedge_2000_firmware 20.4.2, 20.5.1
  • cisco vedge_5000_firmware 20.4.2, 20.5.1
  • cisco vedge_cloud_firmware 20.4.2, 20.5.1

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • Cisco Cisco SD-WAN Solution

Classification

Weakness
  • CWE-250 Execution with Unnecessary Privileges

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.