CVE-2020-36694

MEDIUMNVD 6.79.8▲
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory published 2023-05-22. NVD baseline CVSS 6.7; sources differ by 3.1.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
6.7
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.7Exploit: NoneExposed: 0

A fix is available — apply it.

An issue was discovered in netfilter in the Linux kernel before 5.10. There can be a use-after-free in the packet processing context, because the per-CPU sequence count is mishandled during concurrent iptables rules replacement. This could be exploited with the CAP_NET_ADMIN capability in an unprivileged namespace. NOTE: cc00bca was reverted in 5.12.

CVSS v3
6.7
EG Score
9.8(medium)
EG Risk
60(Track*)
EG Risk 60/100SSVC: 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
Severity98% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS
36.2%
KEV
Not listed

Published

May 21, 2023

Last Modified

January 31, 2025

References (10)

Vendor Advisories for CVE-2020-36694(2)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatkernel-rt-0:4.18.0-305.rt7.72.el82021-05-18redhat
redhatkernel-0:4.18.0-305.el82021-05-18redhat

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.

Data Freshness Timeline

(refreshed 12× in last 7d / 44× 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. 2026-07-23 01:53 UTCEG score recompute
  2. 2026-07-22 22:39 UTCEG score recompute
  3. 2026-07-22 14:05 UTCEPSS rescore
  4. 2026-07-21 15:22 UTCEPSS rescore
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  1. 2026-07-07 13:43 UTCEPSS rescore
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  12. 2026-06-27 20:34 UTCOSV refresh
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  38. 2026-06-10 07:17 UTCOSV refresh
  39. 2026-06-08 14:15 UTCEPSS rescore
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  67. 2026-05-25 00:50 UTCEG score recompute
  68. 2026-05-25 00:50 UTCVendor advisory
  69. 2026-05-25 00:50 UTCGHSA enrichment

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2020-36694?
CVE-2020-36694 is a medium vulnerability published on May 21, 2023. An issue was discovered in netfilter in the Linux kernel before 5.10. There can be a use-after-free in the packet processing context, because the per-CPU sequence count is mishandled during concurrent iptables rules replacement. This could be exploited with the CAPNETADMIN capability in an…
When was CVE-2020-36694 disclosed?
CVE-2020-36694 was first published in the National Vulnerability Database on May 21, 2023, with the most recent update on January 31, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-36694 actively exploited?
CVE-2020-36694 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 36.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-36694?
CVE-2020-36694 has a CVSS v3 base score of 6.7 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.8.
How do I remediate CVE-2020-36694?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-36694, 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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