CVE-2021-3806

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, 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 path traversal vulnerability on Pardus Software Center's "extractArchive" function could allow anyone on the same network to do a man-in-the-middle and write files on the system.

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
48.8%
KEV
Not listed

Published

September 18, 2021

Last Modified

May 18, 2026

Advisory Details (3)

Auto-updated May 18, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

T.C. Siber Güvenlik Başkanlığı

https://www.usom.gov.tr/bildirim/tr-21-0754
generic🟡 PoC Available

Pardus 21 Linux Distro – Remote Code Execution 0day 2021 CVE-2021-3806 – Pentest Blog

https://pentest.blog/pardus-21-linux-distro-remote-code-execution-0day-2021/
generic

T.C. Siber Güvenlik Başkanlığı

https://siberguvenlik.gov.tr/guvenlik-bildirimleri/detay/tr-21-0754

Vendor Advisories for CVE-2021-3806(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 49× 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.

Showing the most recent 100 of 127 total refreshes for this CVE.

  1. 2026-07-15 01:58 UTCEPSS rescore
  2. 2026-07-13 22:27 UTCEPSS rescore
  3. 2026-07-13 22:27 UTCEPSS rescore
  4. 2026-07-13 06:11 UTCEPSS rescore
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  1. 2026-06-28 04:54 UTCEPSS rescore
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  24. 2026-06-15 17:46 UTCEPSS rescore
  25. 2026-06-14 23:15 UTCEPSS rescore
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  27. 2026-06-13 22:58 UTCEPSS rescore
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  29. 2026-06-12 23:10 UTCEPSS rescore
  30. 2026-06-11 13:58 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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  52. 2026-05-31 00:15 UTCEPSS rescore
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  54. 2026-05-29 13:42 UTCEPSS rescore
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  70. 2026-05-22 21:16 UTCEPSS rescore
  71. 2026-05-22 06:46 UTCEG score recompute
  72. 2026-05-22 06:46 UTCGHSA enrichment
  73. 2026-05-21 22:41 UTCEPSS rescore
  74. 2026-05-21 22:41 UTCEPSS rescore
  75. 2026-05-20 22:37 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-3806?
CVE-2021-3806 is a medium vulnerability published on September 18, 2021. A path traversal vulnerability on Pardus Software Center's "extractArchive" function could allow anyone on the same network to do a man-in-the-middle and write files on the system.
When was CVE-2021-3806 disclosed?
CVE-2021-3806 was first published in the National Vulnerability Database on September 18, 2021, with the most recent update on May 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-3806 actively exploited?
CVE-2021-3806 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 48.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-3806?
CVE-2021-3806 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2021-3806?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-3806, 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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