CVE-2020-15636

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 8.5%, top 6% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 9%CVSS: 9.8Exploit: NoneExposed: 0

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

This vulnerability allows remote attackers to execute arbitrary code on affected installations of NETGEAR R6400, R6700, R7000, R7850, R7900, R8000, RS400, and XR300 routers with firmware 1.0.4.84_10.0.58. Authentication is not required to exploit this vulnerability. The specific flaw exists within the check_ra service. A crafted raePolicyVersion in a RAE_Policy.json file can trigger an overflow of a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-9852.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
52(Track)
EG Risk 52/100SSVC: 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%
Exploitation9% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
94.5%
KEV
Not listed

Published

August 20, 2020

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Jun 18, 2026
No patch confirmed yet.
generic

ZDI-20-937 - TrendAI™ Zero Day Initiative™ (ZDI)

https://www.zerodayinitiative.com/advisories/ZDI-20-937/
generic

Security Advisory for Pre-Authentication Stack Overflow on R6700v3, PSV-2020-0224 - NETGEAR Support

https://kb.netgear.com/000062128/Security-Advisory-for-Pre-Authentication-Stack-Overflow-on-R6700v3-PSV-2020-0224

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 47× 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 14:15 UTCEPSS rescore
  2. 2026-07-23 14:15 UTCEPSS rescore
  3. 2026-07-23 01:50 UTCEG score recompute
  4. 2026-07-22 22:35 UTCEG score recompute
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  1. 2026-07-07 13:43 UTCEPSS rescore
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  25. 2026-06-21 01:57 UTCEPSS rescore
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  27. 2026-06-18 17:50 UTCEPSS rescore
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  44. 2026-06-06 13:45 UTCEPSS rescore
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  60. 2026-05-29 13:42 UTCEPSS rescore
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  63. 2026-05-27 13:39 UTCEPSS rescore
  64. 2026-05-27 00:02 UTCEG score recompute
  65. 2026-05-27 00:02 UTCGHSA enrichment
  66. 2026-05-26 07:17 UTCEPSS rescore
  67. 2026-05-26 07:17 UTCEPSS rescore
  68. 2026-05-24 16:48 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2020-15636?
CVE-2020-15636 is a critical vulnerability published on August 20, 2020. This vulnerability allows remote attackers to execute arbitrary code on affected installations of NETGEAR R6400, R6700, R7000, R7850, R7900, R8000, RS400, and XR300 routers with firmware 1.0.4.8410.0.58. Authentication is not required to exploit this vulnerability. The specific flaw exists within…
When was CVE-2020-15636 disclosed?
CVE-2020-15636 was first published in the National Vulnerability Database on August 20, 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-2020-15636 actively exploited?
CVE-2020-15636 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 94.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-15636?
CVE-2020-15636 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2020-15636?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-15636, 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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