CVE-2020-0688

HIGHNVD 8.89.0▲Trending — 5 sources updated this weekExploited in the wild

8.8

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)
EPSS: 100.0%
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.

Microsoft MSRCCVE-2020-06882020-02-11
Microsoft Exchange Validation Key Remote Code Execution Vulnerability

Data Freshness Timeline

(refreshed 20× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-04 01:20 UTCEG score recompute
2026-06-04 01:20 UTCVendor advisory
2026-06-04 01:20 UTCGHSA enrichment
2026-06-03 21:02 UTCEG score recompute
2026-06-03 21:02 UTCVendor advisory
2026-06-03 21:02 UTCGHSA enrichment
2026-06-03 19:09 UTCkev_newly_listed
2026-06-03 16:44 UTCEG score recompute
2026-06-03 16:44 UTCVendor advisory
2026-06-03 16:44 UTCGHSA enrichment
2026-06-03 12:25 UTCEG score recompute
2026-06-03 12:25 UTCVendor advisory
2026-06-03 12:25 UTCGHSA enrichment
2026-06-03 08:07 UTCEG score recompute
2026-06-03 08:07 UTCVendor advisory
2026-06-03 08:07 UTCGHSA enrichment
2026-06-03 03:49 UTCEG score recompute
2026-06-03 03:49 UTCVendor advisory
2026-06-03 03:49 UTCGHSA enrichment
2026-06-02 23:31 UTCEG score recompute

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 ↗

Frequently asked(6)

What is CVE-2020-0688?

CVE-2020-0688 is a high 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2020-0688

Explore →

Is Your Infrastructure Affected by CVE-2020-0688?

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CVE-2020-0688

Published

Last Modified

Advisory Details (4)

Known Exploited Vulnerabilities Catalog | CISA

ZDI-20-258 | Zero Day Initiative

Security Update Guide - Microsoft Security Response Center

Packet Storm

Weakness Classification(3)

All Vendor Advisories

Data Freshness Timeline

Publicly available exploits

Frequently asked(6)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-0688?

Same vendor

Same CWE

CVE-2020-0688

📅 Published

🔄 Last Modified

📋 Advisory Details (4)

Known Exploited Vulnerabilities Catalog | CISA

ZDI-20-258 | Zero Day Initiative

Security Update Guide - Microsoft Security Response Center

Packet Storm

Weakness Classification(3)

All Vendor Advisories

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(6)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-0688?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

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Published

Last Modified

Advisory Details (4)

Frequently asked(6)

Related CVEs(same vendor + same CWE)