CVE-2020-25578

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

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

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 2%CVSS: 5.3Exploit: NoneExposed: 0

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

In FreeBSD 12.2-STABLE before r368969, 11.4-STABLE before r369047, 12.2-RELEASE before p3, 12.1-RELEASE before p13 and 11.4-RELEASE before p7 several file systems were not properly initializing the d_off field of the dirent structures returned by VOP_READDIR. In particular, tmpfs(5), smbfs(5), autofs(5) and mqueuefs(5) were failing to do so. As a result, eight uninitialized kernel stack bytes may be leaked to userspace by these file systems.

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
81.5%
KEV
Not listed

Published

March 26, 2021

Last Modified

November 21, 2024

References (4)

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 40× 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. 2026-07-19 02:26 UTCEPSS rescore
  2. 2026-07-19 02:26 UTCEPSS rescore
  3. 2026-07-18 10:02 UTCEPSS rescore
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  14. 2026-07-09 19:07 UTCEPSS rescore
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  16. 2026-07-07 13:43 UTCEPSS rescore
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  20. 2026-07-06 02:21 UTCEPSS rescore
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  1. 2026-06-30 23:20 UTCEPSS rescore
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  5. 2026-06-28 04:54 UTCEPSS rescore
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  7. 2026-06-27 03:06 UTCEPSS rescore
  8. 2026-06-25 13:47 UTCEPSS rescore
  9. 2026-06-24 14:03 UTCEPSS rescore
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  11. 2026-06-23 21:31 UTCEPSS rescore
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  13. 2026-06-21 01:57 UTCEPSS rescore
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  15. 2026-06-19 19:23 UTCEPSS rescore
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  22. 2026-06-13 22:58 UTCEPSS rescore
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  24. 2026-06-12 23:10 UTCEPSS rescore
  25. 2026-06-11 13:58 UTCEPSS rescore
  26. 2026-06-10 22:16 UTCEPSS rescore
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  28. 2026-06-10 13:20 UTCEPSS rescore
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  39. 2026-06-04 13:10 UTCEPSS rescore
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  41. 2026-06-02 20:11 UTCEPSS rescore
  42. 2026-06-02 20:11 UTCEPSS rescore
  43. 2026-06-01 13:50 UTCEPSS rescore
  44. 2026-06-01 13:50 UTCEPSS rescore
  45. 2026-05-31 22:29 UTCEPSS rescore
  46. 2026-05-31 22:29 UTCEPSS rescore
  47. 2026-05-31 00:15 UTCEPSS rescore
  48. 2026-05-31 00:15 UTCEPSS rescore
  49. 2026-05-29 13:42 UTCEPSS rescore
  50. 2026-05-28 13:43 UTCEPSS rescore
  51. 2026-05-28 13:43 UTCEPSS rescore
  52. 2026-05-27 13:39 UTCEPSS rescore
  53. 2026-05-26 19:06 UTCEG score recompute
  54. 2026-05-26 19:06 UTCGHSA enrichment
  55. 2026-05-26 13:42 UTCEPSS rescore
  56. 2026-05-26 13:42 UTCEPSS rescore
  57. 2026-05-24 16:48 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCfarazsth98/freebsd-dirent-info-leak-bugs
    First seen Dec 5, 2020

    CVE-2020-25578 and CVE-2020-25579: Some FreeBSD info leak bugs I found in 2020.

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2020-25578?
CVE-2020-25578 is a medium vulnerability published on March 26, 2021. In FreeBSD 12.2-STABLE before r368969, 11.4-STABLE before r369047, 12.2-RELEASE before p3, 12.1-RELEASE before p13 and 11.4-RELEASE before p7 several file systems were not properly initializing the doff field of the dirent structures returned by VOPREADDIR. In particular, tmpfs(5), smbfs(5),…
When was CVE-2020-25578 disclosed?
CVE-2020-25578 was first published in the National Vulnerability Database on March 26, 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-2020-25578 actively exploited?
CVE-2020-25578 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 81.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-25578?
CVE-2020-25578 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2020-25578?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-25578, 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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