How severe is CVE-2021-1528?

CVE-2021-1528 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-1528 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-1528?

CVE-2021-1528 primarily affects Cisco Catalyst Sd-wan Manager. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-1528?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-1528 published?

CVE-2021-1528 was published on 2021-06-04 and last updated on 2026-06-17.

CVE-2021-1528

CVE-2021-1528 is a high-severity vulnerability in Cisco Catalyst Sd-wan Manager with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-250.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 7.2
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-250
Affected product: Cisco Catalyst Sd-wan Manager
Published: 2021-06-04
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-1528?: 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.
How severe is CVE-2021-1528?: CVE-2021-1528 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-1528 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-1528?: CVE-2021-1528 primarily affects Cisco Catalyst Sd-wan Manager. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-1528?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-1528 published?: CVE-2021-1528 was published on 2021-06-04 and last updated on 2026-06-17.

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sd-wan-fuErCWwF

Affected products (11)

cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:sd-wan_vbond_orchestrator:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:vsmart_controller:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:vedge_100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:vedge_1000_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:vedge_100b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:vedge_100m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:vedge_100wm_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:vedge_2000_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:vedge_5000_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:vedge_cloud_firmware:*:*:*:*:*:*:*:*

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