CVE-2020-0796
Microsoft SMBv3: Remote Code Execution
As of , CVE-2020-0796 in Microsoft SMBv3 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 10 February 2022
- US federal deadline
- 10 August 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
- 0.96 on 10 February 2022EPSS on the day CISA listed it.
- Public exploit
- 2 Metasploit modules and 3 Exploit-DB entries
- 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
A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain requests. An attacker who successfully exploited the vulnerability could gain the ability to execute code on the target server or client.
CISA's description
A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain requests, aka 'Windows SMBv3 Client/Server Remote Code Execution Vulnerability'.
The CVE record's description, from microsoft
- CVE published
- 12 March 2020
- Assigned by
- microsoft
- CVSS
- 10.0 Critical (CVSS 3.1, from CISA-ADP)
- CWE-119
- Improper Restriction of Operations within the Bounds of a Memory Buffer
- CISA SSVC, exploitation
- active
- CISA SSVC, automatable
- yes
- CISA SSVC, technical impact
- total
Timeline
- The CVE record was published.
- Exploit-DB published an exploit (EDB-ID 48216).
- Exploit-DB published an exploit (EDB-ID 48267).
- Exploit-DB published an exploit (EDB-ID 48537).
- 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: SMBv3 Compression Buffer Overflowexploit module, rank good
- Metasploit: SMBv3 Compression Buffer Overflowexploit module, rank average
- Exploit-DB: Microsoft Windows - 'SMBGhost' Remote Code ExecutionEDB-ID 48537, 2 June 2020
- Exploit-DB: Microsoft Windows 10 (1903/1909) - 'SMBGhost' SMB3.1.1 'SMB2_COMPRESSION_CAPABILITIES' Local Privilege EscalationEDB-ID 48267, 30 March 2020
- Exploit-DB: Microsoft Windows 10 (1903/1909) - 'SMBGhost' SMB3.1.1 'SMB2_COMPRESSION_CAPABILITIES' Buffer Overflow (PoC)EDB-ID 48216, 14 March 2020
Read further
- CVE recordcve.org
- NVD entrynvd.nist.gov
- CISA's catalogcisa.gov
- EPSS for this CVEapi.first.org