CVE-2020-3572
No exploitation reported by the sources we read.
- Published2020-10-21
- Fixed in9.14.1.19 · 9.13.1.13 · 9.12.4.4 · 9.10.1.44 · 9.9.2.80 · 9.8.4.26
- 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 SSL/TLS session handler of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to a memory leak when closing SSL/TLS connections in a specific state. An attacker could exploit this vulnerability by establishing several SSL/TLS sessions and ensuring they are closed under certain conditions. A successful exploit could allow the attacker to exhaust memory resources in the affected device, which would prevent it from processing new SSL/TLS connections, resulting in a DoS. Manual intervention is required to recover an affected device.
Timeline
dates in UTC- 2020-10-2119:15CVE 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-2020-3572?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-3572?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 |
|---|---|---|---|
| 9.14 | ≥ 9.14.0, < 9.14.1.19 | 9.14.1.19 | NVD |
| 9.13 | ≥ 9.13.0, < 9.13.1.13 | 9.13.1.13 | NVD |
| 9.12 | ≥ 9.12.0, < 9.12.4.4 | 9.12.4.4 | NVD |
| 9.10 | ≥ 9.10.0, < 9.10.1.44 | 9.10.1.44 | NVD |
| 9.9 | ≥ 9.9.0, < 9.9.2.80 | 9.9.2.80 | NVD |
| 9.8 | ≥ 9.8.0, < 9.8.4.26 | 9.8.4.26 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 6.x | ≥ 6.5.0, < 6.6.1 | 6.6.1 | NVD |
| 6.4 | ≥ 6.4.0, < 6.4.0.10 | 6.4.0.10 | NVD |
| 6.3 | < 6.3.0.6 | 6.3.0.6 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 9.6 | < 9.6 | 9.6 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Cisco ASA to 9.14.1.19 · 9.13.1.13 · 9.12.4.4 · 9.10.1.44 · 9.9.2.80 · 9.8.4.26
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:C/C:N/I:N/A:H
- Published
- 2020-10-21
- Last Modified
- 2026-08-11
- NVD status
- Modified
Frequently asked questions
What is CVE-2020-3572?
Is CVE-2020-3572 actively exploited?
What is the CVSS score for CVE-2020-3572?
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Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.