CVE-2021-3592

LOWNVD 3.83.8—
EchelonGraph scoreMEDIUM confidence

Score 3.8 from GitHub Security Advisory (severity: LOW) published 2022-05-24. NVD baseline CVSS 3.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
3.8
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 3.8Exploit: NoneExposed: 0

A fix is available — apply it.

An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the bootp_input() function and could occur while processing a udp packet that is smaller than the size of the 'bootp_t' structure. A malicious guest could use this flaw to leak 10 bytes of uninitialized heap memory from the host. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.

CVSS v3
3.8
EG Score
3.8(medium)
EPSS
24.8%
KEV
Not listed

Published

June 15, 2021

Last Modified

November 21, 2024

References (16)

Vendor Advisories for CVE-2021-3592(1)

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

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibslirp-dev (4.4.0-1ubuntu0.21.10.1) @ impish2026-05-26ubuntu
ubuntulibslirp-dev (4.4.0-1ubuntu0.1) @ hirsute2026-05-26ubuntu
ubuntuqemu-system-x86-xen (1:5.2+dfsg-9ubuntu3.1) @ hirsute2026-05-26ubuntu
ubuntuqemu-utils (2.0.0+dfsg-2ubuntu1.47+esm4) @ trusty2026-05-26ubuntu
redhatvirt:rhel-8050020211001230723.b4937e532021-11-09redhat

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.

Weakness Classification(1)

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

Additional Vendor Advisories

(4)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 12× 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 106 total refreshes for this CVE.

  1. 2026-07-21 15:22 UTCEPSS rescore
  2. 2026-07-21 15:22 UTCEPSS rescore
  3. 2026-07-20 17:05 UTCEPSS rescore
  4. 2026-07-19 14:29 UTCEPSS rescore
  5. 2026-07-19 02:27 UTCEPSS rescore
  6. 2026-07-18 18:29 UTCOSV refresh
  7. 2026-07-18 10:02 UTCEPSS rescore
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  9. 2026-07-16 17:00 UTCEPSS rescore
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  11. 2026-07-15 16:55 UTCEPSS rescore
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  1. 2026-07-06 02:21 UTCEPSS rescore
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  7. 2026-07-02 16:57 UTCEPSS rescore
  8. 2026-07-01 15:04 UTCEPSS rescore
  9. 2026-07-01 01:18 UTCOSV refresh
  10. 2026-06-30 23:20 UTCEPSS rescore
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  12. 2026-06-29 14:04 UTCEPSS rescore
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  24. 2026-06-22 14:24 UTCEPSS rescore
  25. 2026-06-21 14:55 UTCEPSS rescore
  26. 2026-06-21 01:58 UTCEPSS rescore
  27. 2026-06-21 01:58 UTCEPSS rescore
  28. 2026-06-19 19:24 UTCEPSS rescore
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  30. 2026-06-18 17:51 UTCEPSS rescore
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  40. 2026-06-13 22:58 UTCEPSS rescore
  41. 2026-06-13 22:58 UTCEPSS rescore
  42. 2026-06-13 03:38 UTCOSV refresh
  43. 2026-06-12 23:10 UTCEPSS rescore
  44. 2026-06-11 13:58 UTCEPSS rescore
  45. 2026-06-11 13:58 UTCEPSS rescore
  46. 2026-06-10 22:16 UTCEPSS rescore
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  48. 2026-06-10 13:20 UTCEPSS rescore
  49. 2026-06-08 14:15 UTCEPSS rescore
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  51. 2026-06-07 15:23 UTCEPSS rescore
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  71. 2026-05-27 13:39 UTCEPSS rescore
  72. 2026-05-27 13:39 UTCEPSS rescore
  73. 2026-05-26 14:52 UTCEG score recompute
  74. 2026-05-26 14:52 UTCVendor advisory
  75. 2026-05-26 14:52 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2021-3592?
CVE-2021-3592 is a low vulnerability published on June 15, 2021. An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the bootpinput() function and could occur while processing a udp packet that is smaller than the size of the 'bootpt' structure. A malicious guest could use this flaw to leak 10…
When was CVE-2021-3592 disclosed?
CVE-2021-3592 was first published in the National Vulnerability Database on June 15, 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-2021-3592 actively exploited?
CVE-2021-3592 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-3592?
CVE-2021-3592 has a CVSS v3 base score of 3.8 (NVD).
How do I remediate CVE-2021-3592?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-3592, 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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