CVE-2021-32827

MEDIUMNVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

Score 6.1 from GitHub Security Advisory published 2021-08-30. NVD baseline CVSS 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.1
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 2%CVSS: 6.1Exploit: NoneExposed: 0

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

MockServer is open source software which enables easy mocking of any system you integrate with via HTTP or HTTPS. An attacker that can trick a victim into visiting a malicious site while running MockServer locally, will be able to run arbitrary code on the MockServer machine. With an overly broad default CORS configuration MockServer allows any site to send cross-site requests. Additionally, MockServer allows you to create dynamic expectations using Javascript or Velocity templates. Both engines may allow an attacker to execute arbitrary code on-behalf of MockServer. By combining these two issues (Overly broad CORS configuration + Script injection), an attacker could serve a malicious page so that if a developer running MockServer visits it, they will get compromised. For more details including a PoC see the referenced GHSL-2021-059.

CVSS v3
6.1
EG Score
6.1(medium)
EPSS
80.1%
KEV
Not listed

Published

August 16, 2021

Last Modified

November 21, 2024

References (4)

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
mavenorg.mock-server:mockserver—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
org.mock-server:mockserver1.10 ... 5.9.0 (90 versions)——

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 45× 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. 2026-07-12 05:44 UTCEPSS rescore
  2. 2026-07-12 05:44 UTCEPSS rescore
  3. 2026-07-11 08:25 UTCEPSS rescore
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  15. 2026-06-30 23:20 UTCEPSS rescore
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  17. 2026-06-29 14:04 UTCEPSS rescore
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  21. 2026-06-27 03:06 UTCEPSS rescore
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  1. 2026-06-23 21:31 UTCEPSS rescore
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  3. 2026-06-22 14:24 UTCEPSS rescore
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  5. 2026-06-21 14:55 UTCEPSS rescore
  6. 2026-06-21 01:58 UTCEPSS rescore
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  8. 2026-06-19 19:24 UTCEPSS rescore
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  10. 2026-06-18 17:51 UTCEPSS rescore
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  19. 2026-06-12 23:10 UTCEPSS rescore
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  21. 2026-06-11 13:58 UTCEPSS rescore
  22. 2026-06-10 22:16 UTCEPSS rescore
  23. 2026-06-10 13:20 UTCEPSS rescore
  24. 2026-06-08 14:15 UTCEPSS rescore
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  26. 2026-06-07 15:23 UTCEPSS rescore
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  40. 2026-05-31 22:29 UTCEPSS rescore
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  42. 2026-05-31 00:15 UTCEPSS rescore
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  44. 2026-05-29 13:42 UTCEPSS rescore
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  46. 2026-05-28 13:43 UTCEPSS rescore
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  48. 2026-05-27 13:39 UTCEPSS rescore
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  50. 2026-05-27 13:39 UTCEPSS rescore
  51. 2026-05-26 13:42 UTCEPSS rescore
  52. 2026-05-26 11:57 UTCEG score recompute
  53. 2026-05-26 11:57 UTCGHSA enrichment
  54. 2026-05-26 07:17 UTCEPSS rescore
  55. 2026-05-26 07:17 UTCEPSS rescore
  56. 2026-05-26 07:17 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-32827?
CVE-2021-32827 is a medium vulnerability published on August 16, 2021. MockServer is open source software which enables easy mocking of any system you integrate with via HTTP or HTTPS. An attacker that can trick a victim into visiting a malicious site while running MockServer locally, will be able to run arbitrary code on the MockServer machine. With an overly broad…
When was CVE-2021-32827 disclosed?
CVE-2021-32827 was first published in the National Vulnerability Database on August 16, 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-2021-32827 actively exploited?
CVE-2021-32827 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 80.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-32827?
CVE-2021-32827 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2021-32827?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-32827, 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.

Dependency Blast Radius

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