How severe is CVE-2021-1371?

CVE-2021-1371 has a CVSS 3.x base score of 6.6, rated medium severity. It is exploitable over physical access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-1371 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-1371?

CVE-2021-1371 affects Cisco Ios Xe Sd-wan. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-1371?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-1371 published?

CVE-2021-1371 was published on 2021-03-24 and last updated on 2026-06-17.

CVE-2021-1371

CVE-2021-1371 is a medium-severity vulnerability in Cisco Ios Xe Sd-wan with a CVSS 3.x base score of 6.6. 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-269.

Key facts

Severity: Medium (CVSS 3.x base score 6.6)
CVSS v2: 7.2
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-269
Affected product: Cisco Ios Xe Sd-wan
Published: 2021-03-24
Last modified: 2026-06-17

Description

A vulnerability in the role-based access control of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker with read-only privileges to obtain administrative privileges by using the console port when the device is in the default SD-WAN configuration. This vulnerability occurs because the default configuration is applied for console authentication and authorization. An attacker could exploit this vulnerability by connecting to the console port and authenticating as a read-only user. A successful exploit could allow a user with read-only permissions to access administrative privileges.

Frequently asked questions

What is CVE-2021-1371?: A vulnerability in the role-based access control of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker with read-only privileges to obtain administrative privileges by using the console port when the device is in the default SD-WAN configuration. This vulnerability occurs because the default configuration is applied for console authentication and authorization. An attacker could exploit this vulnerability by connecting to the console port and authenticating as a read-only user. A successful exploit could allow a user with read-only permissions to access administrative privileges.
How severe is CVE-2021-1371?: CVE-2021-1371 has a CVSS 3.x base score of 6.6, rated medium severity. It is exploitable over physical access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-1371 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-1371?: CVE-2021-1371 affects Cisco Ios Xe Sd-wan. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-1371?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-1371 published?: CVE-2021-1371 was published on 2021-03-24 and last updated on 2026-06-17.

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-esc-rSNVvTf9

Affected products (1)

cpe:2.3:o:cisco:ios_xe_sd-wan:17.2.0:*:*:*:*:*:*:*

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