CVE-2018-0833
The Microsoft Server Message Block 2.0 and 3.0 (SMBv2/SMBv3) client in Windows 8.1 and RT 8.1 and Windows Server 2012 R2 allows a denial of service vulnerability due to how specially crafted requests are handled, aka "SMBv2/SMBv3 Null Dereference Denial…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 39.9%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
Description
The Microsoft Server Message Block 2.0 and 3.0 (SMBv2/SMBv3) client in Windows 8.1 and RT 8.1 and Windows Server 2012 R2 allows a denial of service vulnerability due to how specially crafted requests are handled, aka "SMBv2/SMBv3 Null Dereference Denial of Service Vulnerability".
- CVSS 3.0
- 5.3 MEDIUMCVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 39.90% probability · 99th percentile
- Public exploits
- 1 in Exploit-DB · verified · first 27 February 2018
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- microsoft/windows 8.1 · microsoft/windows rt 8.1 · microsoft/windows server 2012
- Source
- secure@microsoft.com
EPSS moved from 34.1% on 21 September 2026 to 39.9% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- http://www.securityfocus.com/bid/102924Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040375Third Party Advisory, VDB Entry
- https://github.com/KINGSABRI/CVE-in-Ruby/tree/master/CVE-2018-0833Exploit, Third Party Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0833Patch, Vendor Advisory
- https://www.exploit-db.com/exploits/44189/Exploit, Third Party Advisory, VDB Entry
- http://www.securityfocus.com/bid/102924Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040375Third Party Advisory, VDB Entry
- https://github.com/KINGSABRI/CVE-in-Ruby/tree/master/CVE-2018-0833Exploit, Third Party Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0833Patch, Vendor Advisory
- https://www.exploit-db.com/exploits/44189/Exploit, Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.