Auth bypass in Microsoft Exchange_server
CVE-2020-0688
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'.
Vulnerability class: Broken Authentication
EPSS: 1.000 (100.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Microsoft Exchange_server — versions 2010, 2013, 2016
- Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 30 — versions unspecified
- Microsoft Exchange Server 2013 — versions Cumulative Update 23
- Microsoft Exchange Server 2016 Cumulative Update 14 — versions unspecified
- Microsoft Exchange Server 2016 Cumulative Update 15 — versions unspecified
- Microsoft Exchange Server 2019 Cumulative Update 3 — versions unspecified
- Microsoft Exchange Server 2019 Cumulative Update 4 — versions unspecified
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Known ransomware campaign use: yes.
Public proof-of-concept exploits
References
- secure@microsoft.com (Patch, x_refsource_MISC, Vendor Advisory)
- secure@microsoft.com (VDB Entry, Third Party Advisory, x_refsource_MISC)
- secure@microsoft.com (Exploit, VDB Entry, Third Party Advisory, x_refsource_MISC)
- secure@microsoft.com (Exploit, VDB Entry, Third Party Advisory, x_refsource_MISC)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2020-0688?
- CVE-2020-0688 is a high-severity vulnerability in Microsoft Exchange_server, classified under Improper Authentication. CVSS score: 8.8/10. Published 2020-02-11.
- How severe is CVE-2020-0688?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2020-0688 known to be exploited?
- Yes. CVE-2020-0688 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 201 public proof-of-concept repositories are indexed.