CVE-2021-34792
No exploitation reported by the sources we read.
- Published2021-10-27
- Fixed in9.16.2.3 · 9.15.1.17 · 9.14.3.9 · 9.12.4.29 · 9.8.4.40
- WeaknessCWE-400 · CWE-401
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 memory management of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper resource management when connection rates are high. An attacker could exploit this vulnerability by opening a significant number of connections on an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
Timeline
dates in UTC- 2021-10-2719:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-34792?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-34792?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 |
|---|---|---|---|
| 9.16 | ≥ 9.16.0, < 9.16.2.3 | 9.16.2.3 | NVD |
| 9.15 | ≥ 9.15.0, < 9.15.1.17 | 9.15.1.17 | NVD |
| 9.14 | ≥ 9.14.0, < 9.14.3.9 | 9.14.3.9 | NVD |
| 9.12 | ≥ 9.12.0, < 9.12.4.29 | 9.12.4.29 | NVD |
| 9.8 | ≥ 9.8.0, < 9.8.4.40 | 9.8.4.40 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 9.14 | = 009.014\(001.150\) | no fix published | NVD |
| 99.17 | = 099.017\(001.211\) | no fix published | NVD |
| 99.17 | = 099.017\(001.220\) | no fix published | NVD |
| 99.17 | = 099.017\(015.050\) | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 9.14 | = 009.014\(001.150\) | no fix published | NVD |
| 99.17 | = 099.017\(001.211\) | no fix published | NVD |
| 99.17 | = 099.017\(001.220\) | no fix published | NVD |
| 99.17 | = 099.017\(015.050\) | no fix published | NVD |
7 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Cisco ASA to 9.16.2.3 · 9.15.1.17 · 9.14.3.9 · 9.12.4.29 · 9.8.4.40
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
- 2021-10-27
- Last Modified
- 2026-08-11
- NVD status
- Modified
Frequently asked questions
What is CVE-2021-34792?
Is CVE-2021-34792 actively exploited?
What is the CVSS score for CVE-2021-34792?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.