CVE-2021-33527

CRITICALNVD 9.87.8▼
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 2.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 5%CVSS: 9.8Exploit: NoneExposed: 0

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

In MB connect line mbDIALUP versions <= 3.9R0.0 a remote attacker can send a specifically crafted HTTP request to the service running with NT AUTHORITY\SYSTEM that will not correctly validate the input. This can lead to an arbitrary code execution with the privileges of the service.

CVSS v3
9.8
EG Score
7.8(medium)
EPSS
90.5%
KEV
Not listed

Published

August 2, 2021

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated May 26, 2026
No patch confirmed yet.
generic

Advisories

https://cert.vde.com/de-de/advisories/vde-2021-017

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 42× 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. 2026-07-21 15:22 UTCEPSS rescore
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  3. 2026-07-20 17:05 UTCEPSS rescore
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  1. 2026-07-04 06:29 UTCEPSS rescore
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  18. 2026-06-21 14:55 UTCEPSS rescore
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  41. 2026-06-05 22:45 UTCEPSS rescore
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  44. 2026-06-04 13:10 UTCEPSS rescore
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  46. 2026-06-02 20:11 UTCEPSS rescore
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  50. 2026-05-31 22:29 UTCEPSS rescore
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  58. 2026-05-27 13:39 UTCEPSS rescore
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  61. 2026-05-26 13:42 UTCEPSS rescore
  62. 2026-05-26 12:51 UTCEG score recompute
  63. 2026-05-26 12:51 UTCGHSA enrichment
  64. 2026-05-26 07:17 UTCEPSS rescore
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  66. 2026-05-26 07:17 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-33527?
CVE-2021-33527 is a critical vulnerability published on August 2, 2021. In MB connect line mbDIALUP versions <= 3.9R0.0 a remote attacker can send a specifically crafted HTTP request to the service running with NT AUTHORITY\SYSTEM that will not correctly validate the input. This can lead to an arbitrary code execution with the privileges of the service.
When was CVE-2021-33527 disclosed?
CVE-2021-33527 was first published in the National Vulnerability Database on August 2, 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-2021-33527 actively exploited?
CVE-2021-33527 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 90.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-33527?
CVE-2021-33527 has a CVSS v3 base score of 9.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.8.
How do I remediate CVE-2021-33527?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-33527, 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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