CVE-2022-20922Multiple vulnerabilities in the Server Message Block Version 2 (SMB2) processor of the Snort detection engine on multiple Cisco products…
- 5.8MediumCVSS base score
- 0.92%Exploitation in 30 daysEPSS · top 39% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Multiple vulnerabilities in the Server Message Block Version 2 (SMB2) processor of the Snort detection engine on multiple Cisco products could allow an unauthenticated, remote attacker to bypass the configured policies or cause a denial of service (DoS) condition on an affected device. These vulnerabilities are due to improper management of system resources when the Snort detection engine is processing SMB2 traffic. An attacker could exploit these vulnerabilities by sending a high rate of certain types of SMB2 packets through an affected device. A successful exploit could allow the attacker to trigger a reload of the Snort process, resulting in a DoS condition. Note: When the snort preserve-connection option is enabled for the Snort detection engine, a successful exploit could also allow the attacker to bypass the configured policies and deliver a malicious payload to the protected network. The snort preserve-connection setting is enabled by default. See the Details ["#details"] section of this advisory for more information. Note: Only products that have Snort 3 configured are affected. Products that are configured with Snort 2 are not affected.
Timeline
ID reserved
By cisco
- 12 months later
· 12 months later
Published
- 21 months later
· 21 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | Medium5.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L |
| NVDNVD · Modified | 3.1 | Medium6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L |
- EPSS (exploitation in 30 days)
- 0.92% · top 39% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.8.
Affected products
Cisco · Cisco Firepower Threat Defense Software
- affected 7.1.0
- affected 7.1.0.1
- affected 7.1.0.2
- affected 7.2.0
- affected 7.2.0.1
Cisco · Cisco Umbrella Insights Virtual Appliance
- affected 1.5.4
- affected 1.5.5
- affected 1.5.6
- affected 2.0.0
- affected 2.0.2
- affected 2.0.3
- affected 2.1.0
- affected 2.1.2
- affected 2.1.5
- affected 2.1.4
- affected 2.4.12
- affected 2.4.6
- affected 2.4
- affected 2.4.4
- affected 2.5
- affected 2.5.4
- affected 2.5.5
- affected 2.5.6
- affected 2.5.7
- affected 2.6.0
- affected 2.6.1
- affected 2.6.2
- affected 2.7
- affected 2.8
- affected 2.8.9
- affected 3.0
- affected 3.1
- affected 3.2
- affected 2.3.1
- affected 2.3
- affected 2.2
- affected 2.2.1
- affected 3.0.4
- affected 3.0.0
- affected 3.0.1
- affected 3.0.2
- affected 3.0.3
- affected 3.0.5
- affected 3.0.6
- affected 3.1.0
- affected 3.1.2
- affected 3.1.1
- affected 3.2.3
- affected 3.2.1
- affected 3.2.4
- affected 3.2.0
- affected 3.2.2
- affected 4.0.0
- affected 4.0.1
- affected 4.0.2
- affected 4.0.3
- affected 4.1.0
- affected 4.1.1
What to do
Exploitation: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.
References
References1
- cisco-sa-snort-smb-3nfhJtr (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2022-26172 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2022-20922)Record last updated .