CVE-2020-0688
Microsoft Exchange Server: Validation Key Remote Code Execution
As of , CVE-2020-0688 in Microsoft Exchange Server is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch this week.
- Exploited
- Yes: CISA listed it on 3 November 2021
- US federal deadline
- 3 May 2022181 days after CISA listed it. US federal civilian agencies must fix it by then.
- Used in ransomware campaigns
- Known
- EPSS score
- 0.99Higher than 99% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
- EPSS when listed
- Not availableCISA listed it before 4 February 2022, where the EPSS files we read begin.
- Public exploit
- 1 Metasploit module and 2 Exploit-DB entries (1 verified)
- Fix
- No vendor link in CISA's entry
What CISA says to do
Apply updates per vendor instructions.
CISA's required action
What the flaw is
Microsoft Exchange Server Validation Key fails to properly create unique keys at install time, allowing for remote code execution.
CISA's description
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'.
The CVE record's description, from microsoft
- CVE published
- 11 February 2020
- Assigned by
- microsoft
- CVSS
- 8.8 High (CVSS 3.1, from CISA-ADP)
- CWE-287
- Improper Authentication
- CISA SSVC, exploitation
- active
- CISA SSVC, automatable
- no
- CISA SSVC, technical impact
- total
Timeline
- The CVE record was published.
- Exploit-DB published an exploit (EDB-ID 48153).
- Exploit-DB published an exploit (EDB-ID 48168).
- CISA added it to its list of exploited vulnerabilities.
- The US federal deadline to fix it.
Public exploits
Facts from Metasploit's module list and Exploit-DB's index; we never copy exploit code.
- Metasploit: Exchange Control Panel ViewState Deserializationexploit module, rank excellent
- Exploit-DB: Exchange Control Panel - Viewstate Deserialization (Metasploit)EDB-ID 48168, verified by Exploit-DB, 5 March 2020
- Exploit-DB: Microsoft Exchange 2019 15.2.221.12 - Authenticated Remote Code ExecutionEDB-ID 48153, 2 March 2020
Exchange Server: other exploited entries
| Vulnerability | Product | Our group | Listed | Deadline | EPSS |
|---|---|---|---|---|---|
| CVE-2023-21529Deserialization of Untrusted Data | Microsoft Exchange Server | Patch nowRansomware use, listed within a year | 0.59 | ||
| CVE-2022-41040Server-Side Request Forgery | Microsoft Exchange Server | Patch this weekRansomware use; Metasploit module; EPSS 0.99 | 0.99 | ||
| CVE-2022-41082Remote Code Execution | Microsoft Exchange Server | Patch this weekRansomware use; Metasploit module; EPSS 0.99 | 0.99 | ||
| CVE-2021-26855Remote Code Execution | Microsoft Exchange Server | Patch this weekRansomware use; Metasploit module; EPSS 0.99 | 0.99 | ||
| CVE-2021-27065Remote Code Execution | Microsoft Exchange Server | Patch this weekRansomware use; Metasploit module; EPSS 0.99 | 0.99 | ||
| CVE-2021-31207Security Feature Bypass | Microsoft Exchange Server | Patch this weekRansomware use; Metasploit module; EPSS 0.99 | 0.99 | ||
| CVE-2021-34473Remote Code Execution | Microsoft Exchange Server | Patch this weekRansomware use; Metasploit module; EPSS 0.99 | 0.99 | ||
| CVE-2021-34523Privilege Escalation | Microsoft Exchange Server | Patch this weekRansomware use; Metasploit module; EPSS 0.99 | 0.99 | ||
| CVE-2022-41080Privilege Escalation | Microsoft Exchange Server | Patch this weekRansomware use; EPSS 0.77 | 0.77 | ||
| CVE-2021-33766Information Disclosure | Microsoft Exchange Server | Patch this weekEPSS 0.98 | 0.98 |
Read further
- CVE recordcve.org
- NVD entrynvd.nist.gov
- CISA's catalogcisa.gov
- EPSS for this CVEapi.first.org