CVE-2021-34698
No exploitation reported by the sources we read.
- Published2021-10-06
- Fixed in14.0.1-014 · 12.5.2-007 · 12.0.3-005
- WeaknessCWE-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 proxy service of Cisco AsyncOS for Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to exhaust system memory and cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper memory management in the proxy service of an affected device. An attacker could exploit this vulnerability by establishing a large number of HTTPS connections to the affected device. A successful exploit could allow the attacker to cause the system to stop processing new connections, which could result in a DoS condition. Note: Manual intervention may be required to recover from this situation.
Timeline
dates in UTC- 2021-10-0620:15CVE 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-2021-34698?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-34698?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 |
|---|---|---|---|
| 14.0 | ≥ 14.0, < 14.0.1-014 | 14.0.1-014 | NVD |
| 12.5 | ≥ 12.5, < 12.5.2-007 | 12.5.2-007 | NVD |
| 12.0 | ≥ 12.0, < 12.0.3-005 | 12.0.3-005 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Cisco asyncos to 14.0.1-014 · 12.5.2-007 · 12.0.3-005
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
- 2021-10-06
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2021-34698?
Is CVE-2021-34698 actively exploited?
What is the CVSS score for CVE-2021-34698?
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