CVE-2021-1535
MEDIUMDescription
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 to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Exploit Intelligence
Moderate risk: more likely to be exploited than 66% of all known CVEs.
References
Related Vulnerabilities
Other CWE-497 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2021-31955 | Medium | 5.5 | 81% | KEV | Fix |
| CVE-2026-7864 | Medium | 6.9 | 17% | - | - |
| CVE-2025-44823 | Critical | 9.9 | 16% | - | Fix |
| CVE-2025-55131 | High | 7.1 | 3.3% | - | Fix |
| CVE-2026-34413 | High | 8.6 | 3.1% | - | - |
| CVE-2024-13999 | Critical | 9.8 | 1.8% | - | Fix |
Common questions
How do I fix CVE-2021-1535?
Upgrade sd-wan vmanage to 20.5.1 or later.
Is CVE-2021-1535 being actively exploited?
Not that we know of. CVE-2021-1535 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.2% is the estimated probability that it will be exploited in the next 30 days. That is higher than 66% of all scored CVEs.
How severe is CVE-2021-1535?
CVE-2021-1535 has a CVSS v3 base score of 5.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2021-1535 affect?
Published advisories record a fix for sd-wan vmanage (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2021-1535
Markdown
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TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.
This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.