How severe is CVE-2021-1535?

CVE-2021-1535 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2021-1535 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-1535?

CVE-2021-1535 affects Cisco Sd-wan Vmanage. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-1535?

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

When was CVE-2021-1535 published?

CVE-2021-1535 was published on 2021-05-06 and last updated on 2026-06-17.

CVE-2021-1535

CVE-2021-1535 is a medium-severity vulnerability in Cisco Sd-wan Vmanage with a CVSS 3.x base score of 5.3. 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-497.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-497
Affected product: Cisco Sd-wan Vmanage
Published: 2021-05-06
Last modified: 2026-06-17

Description

A vulnerability in the cluster management interface of Cisco SD-WAN vManage Software could allow an unauthenticated, remote attacker to view sensitive information on an affected system. To be affected by this vulnerability, the Cisco SD-WAN vManage Software must be in cluster mode. This vulnerability is due to the absence of authentication for sensitive information in the cluster management interface. An attacker could exploit this vulnerability by sending a crafted request to the cluster management interface of an affected system. A successful exploit could allow the attacker to allow the attacker to view sensitive information on the affected system.

Frequently asked questions

What is CVE-2021-1535?: A vulnerability in the cluster management interface of Cisco SD-WAN vManage Software could allow an unauthenticated, remote attacker to view sensitive information on an affected system. To be affected by this vulnerability, the Cisco SD-WAN vManage Software must be in cluster mode. This vulnerability is due to the absence of authentication for sensitive information in the cluster management interface. An attacker could exploit this vulnerability by sending a crafted request to the cluster management interface of an affected system. A successful exploit could allow the attacker to allow the attacker to view sensitive information on the affected system.
How severe is CVE-2021-1535?: CVE-2021-1535 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2021-1535 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-1535?: CVE-2021-1535 affects Cisco Sd-wan Vmanage. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-1535?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-1535 published?: CVE-2021-1535 was published on 2021-05-06 and last updated on 2026-06-17.

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-vmanageinfdis-LKrFpbv

Affected products (1)

cpe:2.3:a:cisco:sd-wan_vmanage:*:*:*:*:*:*:*:*

More vulnerabilities in Cisco Sd-wan Vmanage

CVE-2021-44228 — Critical (CVSS 10.0): Apache Log4j2 2.0-beta9 through 2.15.0 (excluding security releases 2.12.2, 2.12.3, and 2.3.1) JNDI features used in…
CVE-2021-1508 — Critical (CVSS 9.8): Multiple vulnerabilities in Cisco SD-WAN vManage Software could allow an unauthenticated, remote attacker to execute…
CVE-2021-1506 — Critical (CVSS 9.8): Multiple vulnerabilities in Cisco SD-WAN vManage Software could allow an unauthenticated, remote attacker to execute…
CVE-2021-1505 — Critical (CVSS 9.8): Multiple vulnerabilities in Cisco SD-WAN vManage Software could allow an unauthenticated, remote attacker to execute…
CVE-2021-1468 — Critical (CVSS 9.8): Multiple vulnerabilities in Cisco SD-WAN vManage Software could allow an unauthenticated, remote attacker to execute…
CVE-2021-1275 — Critical (CVSS 9.8): Multiple vulnerabilities in Cisco SD-WAN vManage Software could allow an unauthenticated, remote attacker to execute…

All CVEs affecting Cisco Sd-wan Vmanage →

Other CWE-497 vulnerabilities

CVE-2025-10264 — Critical (CVSS 10.0): Certain models of NVR developed by Digiever has an Exposure of Sensitive Information vulnerability, allowing…
CVE-2026-27494 — Critical (CVSS 9.9): n8n is an open source workflow automation platform. Prior to versions 2.10.1, 2.9.3, and 1.123.22, an authenticated…
CVE-2025-47699 — Critical (CVSS 9.9): Exposure of Sensitive System Information to an Unauthorized Control Sphere (CWE-497) in the Gallagher Morpho…
CVE-2025-44823 — Critical (CVSS 9.9): Nagios Log Server before 2024R1.3.2 allows authenticated users to retrieve cleartext administrative API keys via a…
CVE-2026-14808 — Critical (CVSS 9.8): Prog Management System developed by PROG MIS has a Exposure of Sensitive Information vulnerability, allowing…
CVE-2024-13999 — Critical (CVSS 9.8): Nagios XI versions prior to 2024R1.1.3, under certain circumstances, disclose the server's Active Directory (AD) or…

Browse all CWE-497 vulnerabilities →