CVE-2021-1535

MEDIUMNVD 5.35.3
EchelonGraph scoreLOW confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: nvd
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 5.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
5.3
EG Score
5.3(low)
EPSS
65.4%
KEV
Not listed

Published

May 6, 2021

Last Modified

November 21, 2024

References (2)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 14:05 UTCEPSS rescore
  2. 2026-07-21 15:22 UTCEPSS rescore
  3. 2026-07-21 15:22 UTCEPSS rescore
  4. 2026-07-20 17:04 UTCEPSS rescore
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  1. 2026-07-04 06:29 UTCEPSS rescore
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  3. 2026-07-01 15:03 UTCEPSS rescore
  4. 2026-06-30 23:20 UTCEPSS rescore
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  6. 2026-06-29 14:04 UTCEPSS rescore
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  8. 2026-06-28 14:05 UTCEPSS rescore
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  19. 2026-06-22 14:24 UTCEPSS rescore
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  21. 2026-06-21 14:54 UTCEPSS rescore
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  23. 2026-06-21 01:58 UTCEPSS rescore
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  25. 2026-06-19 19:24 UTCEPSS rescore
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  27. 2026-06-18 17:51 UTCEPSS rescore
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  42. 2026-06-07 15:23 UTCEPSS rescore
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  44. 2026-06-06 13:46 UTCEPSS rescore
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  49. 2026-06-05 06:09 UTCEPSS rescore
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  55. 2026-06-01 13:50 UTCEPSS rescore
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  57. 2026-05-31 22:29 UTCEPSS rescore
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  61. 2026-05-29 13:42 UTCEPSS rescore
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  67. 2026-05-26 07:17 UTCEPSS rescore
  68. 2026-05-26 07:17 UTCEPSS rescore
  69. 2026-05-24 16:49 UTCEPSS rescore
  70. 2026-05-23 08:09 UTCEG score recompute
  71. 2026-05-23 08:09 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-1535?
CVE-2021-1535 is a medium vulnerability published on May 6, 2021. 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…
When was CVE-2021-1535 disclosed?
CVE-2021-1535 was first published in the National Vulnerability Database on May 6, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-1535 actively exploited?
CVE-2021-1535 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 65.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-1535?
CVE-2021-1535 has a CVSS v3 base score of 5.3 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2021-1535?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-1535, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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