CVE-2024-20353
Confirmed PUBLISHEDA vulnerability in the management and VPN web servers for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD)...
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
A vulnerability in the management and VPN web servers for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to incomplete error checking when parsing an HTTP header. An attacker could exploit this vulnerability by sending a crafted HTTP request to a targeted web server on a device. A successful exploit could allow the attacker to cause a DoS condition when the device reloads.
- CVE Published
- Apr 24, 2024
- Exploitation Reported
- Apr 24, 2024
- CVSS
- 8.6 High
- EPSS
- —
Affected Versions
285 version rows · page 5 of 12
| Vendor | Product | Version | Status |
|---|---|---|---|
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.12.4.50 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.12.4.52 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.12.4.54 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.12.4.55 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.12.4.56 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.12.4.58 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.12.4.62 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.12.4.65 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.14.1 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.14.1.10 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.14.1.6 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.14.1.15 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.14.1.19 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.14.1.30 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.14.2 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.14.2.4 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.14.2.8 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.14.2.13 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.14.2.15 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.14.3 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.14.3.1 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.14.3.9 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.14.3.11 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.14.3.13 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
9.14.3.18 |
Affected |
CVE References
- cisco-sa-asaftd-websrvs-dos-X8gNucD2 sec.cloudapps.cisco.com · CVE Record https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurity...
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2024-04-24 00:00 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Exploitation Status
Exploited in the wild
Recorded 2024-04-24 00:00:00 UTC · CISA
Weaknesses (CWE)
-
Loop with Unreachable Exit Condition ('Infinite Loop')
Scanner Integrations
| Scanner | Reference | Detected |
|---|---|---|
| Nessus | https://www.tenable.com/plugins/nessus/193915 | Jun 02, 2025 |
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
09:26 UTC about 1 year ago09:26 UTC · about 1 year ago
Nessus plugin available
Scanner coverage available
-
18:15 UTC about 2 years ago18:15 UTC · about 2 years ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC about 2 years ago00:00 UTC · about 2 years ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
15:08 UTC over 2 years ago15:08 UTC · over 2 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2024-20353
{
"cve_id": "CVE-2024-20353",
"title": "A vulnerability in the management and VPN web servers for Cisco Adaptive Secu...",
"affected_vendor": "Cisco",
"affected_product": "Cisco Adaptive Security Appliance (ASA) Software, Cisco Firepower Threat Defense Software",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 8.6,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}