CVE-2022-20751
No exploitation reported by the sources we read.
- Published2022-05-03
- Fixed in7.0.2 · 6.6.5.2 · 6.4.0.15
- WeaknessCWE-770
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
A vulnerability in the Snort detection engine integration for Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause unlimited memory consumption, which could lead to a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient memory management for certain Snort events. An attacker could exploit this vulnerability by sending a series of crafted IP packets that would generate specific Snort events on an affected device. A sustained attack could cause an out of memory condition on the affected device. A successful exploit could allow the attacker to interrupt all traffic flowing through the affected device. In some circumstances, the attacker may be able to cause the device to reload, resulting in a DoS condition.
Timeline
dates in UTC- 2022-05-0304:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2022-20751?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2022-20751?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 7.0 | ≥ 7.0.0, < 7.0.2 | 7.0.2 | NVD |
| 6.x | ≥ 6.5.0, < 6.6.5.2 | 6.6.5.2 | NVD |
| 6.4 | < 6.4.0.15 | 6.4.0.15 | NVD |
| 7.1 | = 7.1.0.0 | no fix published | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Cisco secure firewall threat defense to 7.0.2 · 6.6.5.2 · 6.4.0.15
Advisories and patches
- tools.cisco.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2022-05-03
- Last Modified
- 2026-08-11
- NVD status
- Modified
Frequently asked questions
What is CVE-2022-20751?
Is CVE-2022-20751 actively exploited?
What is the CVSS score for CVE-2022-20751?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.