How to check if you are exposed to CVE-2020-0688
- Find every Microsoft Exchange Server system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
- Compare each version with the fixed versions in the vendor advisory. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
- Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2020-0688.
US federal agencies had to fix this by 2022-05-03. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.
Affected versions
Versions the National Vulnerability Database lists as vulnerable to CVE-2020-0688. Check the vendor advisory for the exact fixed builds before you sign anything off.
| Product | Vulnerable versions |
|---|---|
| Microsoft Exchange Server | 2010-sp3_rollup_30; 2013-cumulative_update_23; 2016-cumulative_update_14; 2016-cumulative_update_15; 2019-cumulative_update_3; 2019-cumulative_update_4 |
Timeline
- · Published in the National Vulnerability Database
- · Added to CISA's Known Exploited Vulnerabilities catalog, 631 days after it was published
- · Fix-by date for US federal agencies, passed 1,643 days ago
Weakness type
More exploited Microsoft vulnerabilities
CISA lists 390 exploited Microsoft vulnerabilities. The closest matches:
- CVE-2023-21529Microsoft Exchange Server Deserialization of Untrusted Data VulnerabilityAdded 2026-04-13
- CVE-2021-31196Microsoft Exchange Server Information Disclosure VulnerabilityAdded 2024-08-21
- CVE-2024-21410Microsoft Exchange Server Privilege Escalation VulnerabilityAdded 2024-02-15
- CVE-2022-41080Microsoft Exchange Server Privilege Escalation VulnerabilityAdded 2023-01-10
- CVE-2022-41082Microsoft Exchange Server Remote Code Execution VulnerabilityAdded 2022-09-30
- CVE-2022-41040Microsoft Exchange Server Server-Side Request Forgery VulnerabilityAdded 2022-09-30
- CVE-2018-8581Microsoft Exchange Server Privilege Escalation VulnerabilityAdded 2022-03-03
- CVE-2021-33766Microsoft Exchange Server Information DisclosureAdded 2022-01-18
Keep going
Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.