CVE-2020-1350

CRITICALNVD 10.010.0—
EchelonGraph scoreHIGH confidence

Score elevated to 10.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 10.0 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 sources updated this weekExploited in the wild
10.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 91%CVSS: 10.0Exploit: cisa kev · ssvc active · epss top5pct · epss high · public exploitExposed: 0

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

A remote code execution vulnerability exists in Windows Domain Name System servers when they fail to properly handle requests, aka 'Windows DNS Server Remote Code Execution Vulnerability'.

CVSS v3
10.0
EG Score
10.0(high)
EG Risk
100(Act)
EG Risk 100/100SSVC: Act

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
Severity100% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
91%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

July 14, 2020

Last Modified

December 18, 2025

Advisory Details (3)

Auto-updated Aug 15, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: microsoft, cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-1350
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1350
generic

Locked Out | Packet Storm

http://packetstormsecurity.com/files/158484/SIGRed-Windows-DNS-Denial-Of-Service.html

Weakness Classification(3)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 98× in last 7d / 352× 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 1,017 total refreshes for this CVE.

  1. 2026-08-21 14:12 UTCVendor advisory
  2. 2026-08-21 14:12 UTCGHSA enrichment
  3. 2026-08-21 10:20 UTCVendor advisory
  4. 2026-08-21 10:20 UTCGHSA enrichment
  5. 2026-08-21 06:28 UTCVendor advisory
  6. 2026-08-21 06:28 UTCGHSA enrichment
  7. 2026-08-21 02:35 UTCEG score recompute
  8. 2026-08-21 02:35 UTCGHSA enrichment
  9. 2026-08-20 22:52 UTCEPSS rescore
  10. 2026-08-20 22:43 UTCVendor advisory
  11. 2026-08-20 22:43 UTCGHSA enrichment
  12. 2026-08-20 18:51 UTCVendor advisory
  13. 2026-08-20 18:51 UTCGHSA enrichment
  14. 2026-08-20 17:06 UTCCISA KEV update
  15. 2026-08-20 14:59 UTCVendor advisory
  16. 2026-08-20 14:59 UTCGHSA enrichment
  17. 2026-08-20 11:06 UTCVendor advisory
  18. 2026-08-20 11:06 UTCGHSA enrichment
  19. 2026-08-20 07:14 UTCVendor advisory
  20. 2026-08-20 07:14 UTCGHSA enrichment
  21. 2026-08-20 03:22 UTCGHSA enrichment
  22. 2026-08-19 23:30 UTCVendor advisory
  23. 2026-08-19 23:30 UTCGHSA enrichment
  24. 2026-08-19 19:38 UTCEG score recompute
  25. 2026-08-19 19:38 UTCVendor advisory
Show 75 more
  1. 2026-08-19 19:38 UTCGHSA enrichment
  2. 2026-08-19 17:33 UTCCISA KEV update
  3. 2026-08-19 17:00 UTCEPSS rescore
  4. 2026-08-19 15:45 UTCVendor advisory
  5. 2026-08-19 15:45 UTCGHSA enrichment
  6. 2026-08-19 11:52 UTCVendor advisory
  7. 2026-08-19 11:52 UTCGHSA enrichment
  8. 2026-08-19 07:59 UTCVendor advisory
  9. 2026-08-19 07:59 UTCGHSA enrichment
  10. 2026-08-19 04:07 UTCVendor advisory
  11. 2026-08-19 04:07 UTCGHSA enrichment
  12. 2026-08-19 00:14 UTCVendor advisory
  13. 2026-08-19 00:14 UTCGHSA enrichment
  14. 2026-08-18 20:21 UTCVendor advisory
  15. 2026-08-18 20:21 UTCGHSA enrichment
  16. 2026-08-18 16:58 UTCCISA KEV update
  17. 2026-08-18 16:29 UTCEG score recompute
  18. 2026-08-18 16:29 UTCVendor advisory
  19. 2026-08-18 16:28 UTCGHSA enrichment
  20. 2026-08-18 13:44 UTCEPSS rescore
  21. 2026-08-18 12:33 UTCVendor advisory
  22. 2026-08-18 12:33 UTCGHSA enrichment
  23. 2026-08-18 08:39 UTCGHSA enrichment
  24. 2026-08-18 04:47 UTCGHSA enrichment
  25. 2026-08-18 00:55 UTCVendor advisory
  26. 2026-08-18 00:55 UTCGHSA enrichment
  27. 2026-08-17 20:59 UTCVendor advisory
  28. 2026-08-17 20:59 UTCGHSA enrichment
  29. 2026-08-17 17:07 UTCEG score recompute
  30. 2026-08-17 17:07 UTCVendor advisory
  31. 2026-08-17 17:07 UTCGHSA enrichment
  32. 2026-08-17 13:56 UTCCISA KEV update
  33. 2026-08-17 13:43 UTCEPSS rescore
  34. 2026-08-17 13:15 UTCVendor advisory
  35. 2026-08-17 13:15 UTCGHSA enrichment
  36. 2026-08-17 09:23 UTCVendor advisory
  37. 2026-08-17 09:23 UTCGHSA enrichment
  38. 2026-08-17 05:31 UTCVendor advisory
  39. 2026-08-17 05:31 UTCGHSA enrichment
  40. 2026-08-17 01:39 UTCVendor advisory
  41. 2026-08-17 01:39 UTCGHSA enrichment
  42. 2026-08-16 21:47 UTCVendor advisory
  43. 2026-08-16 21:47 UTCGHSA enrichment
  44. 2026-08-16 17:55 UTCEG score recompute
  45. 2026-08-16 17:55 UTCVendor advisory
  46. 2026-08-16 17:55 UTCGHSA enrichment
  47. 2026-08-16 14:52 UTCEPSS rescore
  48. 2026-08-16 14:03 UTCVendor advisory
  49. 2026-08-16 14:03 UTCGHSA enrichment
  50. 2026-08-16 10:10 UTCVendor advisory
  51. 2026-08-16 10:10 UTCGHSA enrichment
  52. 2026-08-16 06:18 UTCVendor advisory
  53. 2026-08-16 06:18 UTCGHSA enrichment
  54. 2026-08-16 02:26 UTCEG score recompute
  55. 2026-08-16 02:26 UTCVendor advisory
  56. 2026-08-16 02:26 UTCGHSA enrichment
  57. 2026-08-16 02:11 UTCEPSS rescore
  58. 2026-08-15 22:34 UTCVendor advisory
  59. 2026-08-15 22:34 UTCGHSA enrichment
  60. 2026-08-15 18:42 UTCVendor advisory
  61. 2026-08-15 18:42 UTCGHSA enrichment
  62. 2026-08-15 14:50 UTCVendor advisory
  63. 2026-08-15 14:50 UTCGHSA enrichment
  64. 2026-08-15 10:58 UTCVendor advisory
  65. 2026-08-15 10:58 UTCGHSA enrichment
  66. 2026-08-15 07:06 UTCVendor advisory
  67. 2026-08-15 07:06 UTCGHSA enrichment
  68. 2026-08-15 03:14 UTCVendor advisory
  69. 2026-08-15 03:14 UTCGHSA enrichment
  70. 2026-08-14 23:21 UTCVendor advisory
  71. 2026-08-14 23:21 UTCGHSA enrichment
  72. 2026-08-14 19:29 UTCVendor advisory
  73. 2026-08-14 19:29 UTCGHSA enrichment
  74. 2026-08-14 15:37 UTCVendor advisory
  75. 2026-08-14 15:37 UTCGHSA enrichment

Publicly available exploits

(10 references)

Working exploit code is in the public domain (10 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCgraph-inc/CVE-2020-1350
    First seen Jul 18, 2020

    Scanner and Mitigator for CVE 2020-1350

    Open source ↗
  • GitHub PoCconnormcgarr/CVE-2020-1350
    First seen Jul 17, 2020

    CVE-2020-1350 Proof-of-Concept

    Open source ↗
  • GitHub PoCcaptainGeech42/CVE-2020-1350
    First seen Jul 16, 2020

    Denial of Service PoC for CVE-2020-1350 (SIGRed)

    Open source ↗
  • GitHub PoCT13nn3s/CVE-2020-1350
    First seen Jul 15, 2020

    This Powershell Script is checking if your server is vulnerable for the CVE-2020-1350 Remote Code Execution flaw in the Windows DNS Service

    Open source ↗
  • GitHub PoCmaxpl0it/CVE-2020-1350-DoS
    First seen Jul 15, 2020

    A denial-of-service proof-of-concept for CVE-2020-1350

    Open source ↗
  • GitHub PoCcorelight/SIGRed
    First seen Jul 15, 2020

    Detection of attempts to exploit Microsoft Windows DNS server via CVE-2020-1350 (AKA SIGRed)

    Open source ↗
  • GitHub PoCzoomerxsec/Fake_CVE-2020-1350
    First seen Jul 14, 2020

    Fake exploit tool, designed to rickroll users attempting to actually exploit.

    Open source ↗
  • GitHub PoCmr-r3b00t/CVE-2020-1350
    First seen Jul 14, 2020
    Open source ↗
  • GitHub PoCZephrFish/CVE-2020-1350_HoneyPoC
    First seen Jul 14, 2020

    HoneyPoC: Proof-of-Concept (PoC) script to exploit SIGRed (CVE-2020-1350). Achieves Domain Admin on Domain Controllers running Windows Server 2000 up to Windows Server 2019.

    Open source ↗
  • GitHub PoCpsc4re/NSE-scripts
    First seen Mar 11, 2020

    NSE scripts to detect CVE-2020-1350 SIGRED and CVE-2020-0796 SMBGHOST, CVE-2021-21972, proxyshell, CVE-2021-34473

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2020-1350?
CVE-2020-1350 is a critical vulnerability published on July 14, 2020. A remote code execution vulnerability exists in Windows Domain Name System servers when they fail to properly handle requests, aka 'Windows DNS Server Remote Code Execution Vulnerability'.
When was CVE-2020-1350 disclosed?
CVE-2020-1350 was first published in the National Vulnerability Database on July 14, 2020, with the most recent update on December 18, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-1350 actively exploited?
Yes. CISA added CVE-2020-1350 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Microsoft Windows. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2020-1350?
CVE-2020-1350 has a CVSS v3 base score of 10.0 (NVD).
Which products are affected by CVE-2020-1350?
CVE-2020-1350 affects Microsoft Windows. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2020-1350?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-1350, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2020-1350

Explore →

Is Your Infrastructure Affected by CVE-2020-1350?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs