CVE-2020-25637

MEDIUMNVD 6.76.7—
EchelonGraph scoreMEDIUM confidence

Score 6.7 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 6.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.7Exploit: None knownExposed: 0

A fix is available — apply it.

A double free memory issue was found to occur in the libvirt API, in versions before 6.8.0, responsible for requesting information about network interfaces of a running QEMU domain. This flaw affects the polkit access control driver. Specifically, clients connecting to the read-write socket with limited ACL permissions could use this flaw to crash the libvirt daemon, resulting in a denial of service, or potentially escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVSS v3
6.7
EG Score
6.7(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity67% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

October 6, 2020

Last Modified

November 21, 2024

References (10)

Vendor Advisories for CVE-2020-25637(1)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibvirt-doc (7.6.0-0ubuntu1.2) @ impish2026-05-23ubuntu
redhatvirt:rhel-8040020210317013608.9f9e2e7e2021-05-18redhat
redhatvirt-devel:8.2-8020120201106174547.863bb0db2020-11-18redhat
redhatlibvirt-0:4.5.0-36.el7_9.32020-11-10redhat

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

(7 across 7 ecosystems)
Alpine:v3.12(1)
PackageVulnerable rangeFixed inDependents
libvirt—6.6.0-r3—
Debian:10(1)
PackageVulnerable rangeFixed inDependents
libvirt5.0.0-4, 5.0.0-4+deb10u15.0.0-4+deb10u2—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libvirt—6.8.0-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libvirt—6.8.0-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libvirt—6.8.0-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libvirt—6.8.0-1—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
libvirt3.0.0-4 ... 3.0.0-4+deb9u4 (6 versions)3.0.0-4+deb9u5—

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 7× in last 7d / 25× 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 146 total refreshes for this CVE.

  1. 2026-09-08 21:56 UTCEPSS rescore
  2. 2026-09-07 15:57 UTCEPSS rescore
  3. 2026-09-06 13:44 UTCEPSS rescore
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  8. 2026-09-01 04:59 UTCOSV refresh
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  22. 2026-08-15 04:07 UTCOSV refresh
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  1. 2026-08-09 13:43 UTCEPSS rescore
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  11. 2026-07-30 16:50 UTCOSV refresh
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  22. 2026-07-23 01:51 UTCEG score recompute
  23. 2026-07-22 22:37 UTCEG score recompute
  24. 2026-07-22 14:05 UTCEPSS rescore
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  40. 2026-07-13 01:38 UTCOSV refresh
  41. 2026-07-12 05:44 UTCEPSS rescore
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  44. 2026-07-09 19:07 UTCEPSS rescore
  45. 2026-07-08 15:12 UTCEPSS rescore
  46. 2026-07-07 13:43 UTCEPSS rescore
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  50. 2026-07-06 02:21 UTCEPSS rescore
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  66. 2026-06-24 11:20 UTCOSV refresh
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  75. 2026-06-19 19:23 UTCEPSS rescore

Frequently asked(5)

What is CVE-2020-25637?
CVE-2020-25637 is a medium vulnerability published on October 6, 2020. A double free memory issue was found to occur in the libvirt API, in versions before 6.8.0, responsible for requesting information about network interfaces of a running QEMU domain. This flaw affects the polkit access control driver. Specifically, clients connecting to the read-write socket with…
When was CVE-2020-25637 disclosed?
CVE-2020-25637 was first published in the National Vulnerability Database on October 6, 2020, 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-2020-25637 actively exploited?
CVE-2020-25637 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.1% of all scored CVEs.
What is the CVSS score of CVE-2020-25637?
CVE-2020-25637 has a CVSS v3 base score of 6.7 (NVD).
How do I remediate CVE-2020-25637?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-25637, 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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