CVE-2020-0688

CRITICALNVD 8.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 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 8.8 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
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 100%CVSS: 8.8Exploit: cisa kev · ssvc active · kev ransomware · Metasploit · Exploit-DB (verified) · 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 Microsoft Exchange software when the software fails to properly handle objects in memory, aka 'Microsoft Exchange Memory Corruption Vulnerability'.

CVSS v3
8.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
100%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

February 11, 2020

Last Modified

October 29, 2025

Advisory Details (4)

Auto-updated Jun 2, 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-2020-0688
generic

ZDI-20-258 | Zero Day Initiative

https://www.zerodayinitiative.com/advisories/ZDI-20-258/
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-2020-0688
generic

Packet Storm

http://packetstormsecurity.com/files/156620/Exchange-Control-Panel-Viewstate-Deserialization.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 83× in last 7d / 341× 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 1,223 total refreshes for this CVE.

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

Publicly available exploits

(10 references)

Working exploit code is in the public domain (8 GitHub PoCs) (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCW01fh4cker/CVE-2020-0688-GUI
    First seen May 9, 2024

    GUI Exploit Tool for CVE-2020-0688(Microsoft Exchange default MachineKeySection deserialize vulnerability)

    Open source ↗
  • GitHub PoCMrTiz/CVE-2020-0688
    First seen Jan 4, 2021

    Remote Code Execution on Microsoft Exchange Server through fixed cryptographic keys

    Open source ↗
  • GitHub PoCw4fz5uck5/cve-2020-0688-webshell-upload-technique
    First seen Jun 12, 2020

    cve-2020-0688 UNIVERSAL Python implementation utilizing ASPX webshell for command output

    Open source ↗
  • GitHub PoCravinacademy/CVE-2020-0688
    First seen Mar 31, 2020

    Exploitation Script for CVE-2020-0688 "Microsoft Exchange default MachineKeySection deserialize vulnerability"

    Open source ↗
  • Exploit-DBEDB-48168✓ verified
    First seen Mar 5, 2020

    Exchange Control Panel - Viewstate Deserialization (Metasploit)

    Open source ↗
  • Exploit-DBEDB-48153
    First seen Mar 2, 2020

    Microsoft Exchange 2019 15.2.221.12 - Authenticated Remote Code Execution

    Open source ↗
  • GitHub PoCzcgonvh/CVE-2020-0688
    First seen Mar 1, 2020

    Exploit and detect tools for CVE-2020-0688

    Open source ↗
  • GitHub PoConSec-fr/CVE-2020-0688-Scanner
    First seen Feb 28, 2020

    Quick tool for checking CVE-2020-0688 on multiple hosts with a non-intrusive method.

    Open source ↗
  • GitHub PoCRidter/cve-2020-0688
    First seen Feb 27, 2020

    cve-2020-0688

    Open source ↗
  • GitHub PoCYt1g3r/CVE-2020-0688_EXP
    First seen Feb 27, 2020

    CVE-2020-0688_EXP Auto trigger payload & encrypt method

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2020-0688?
CVE-2020-0688 is a critical vulnerability published on February 11, 2020. A remote code execution vulnerability exists in Microsoft Exchange software when the software fails to properly handle objects in memory, aka 'Microsoft Exchange Memory Corruption Vulnerability'.
When was CVE-2020-0688 disclosed?
CVE-2020-0688 was first published in the National Vulnerability Database on February 11, 2020, with the most recent update on October 29, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-0688 actively exploited?
Yes. CISA added CVE-2020-0688 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Microsoft Exchange Server. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2020-0688?
CVE-2020-0688 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2020-0688?
CVE-2020-0688 affects Microsoft Exchange Server. 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-2020-0688?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-0688, 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-2020-0688

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