onyx --cves cve-2024-20353
CVE-2024-20353
- score
- <0.1
- cvss
- 8.6
- epss
- 70.7%
- published
- 2024-04-24
- kev added
- 2024-04-24
- first seen
Cisco ASA and FTD Software management and VPN web servers contain a denial of service caused by incomplete error checking when parsing HTTP headers, letting unauthenticated remote attackers cause device reloads, exploit requires sending crafted HTTP requests.
Timeline
How this CVE moved toward exploitation. Chart: last 30 days — trend score, EPSS, community mentions per day; hover the event lane.
- Published
- Added to CISA KEV
- Tracked by Onyx
- Public PoC
Exploit availability
Public PoC flagged by vulnx; no direct exploit link among the citations.
Weaknesses
References 13
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-websrvs-dos-X8gNucD2
- https://nvd.nist.gov/vuln/detail/CVE-2024-20353
- https://blog.talosintelligence.com/arcanedoor-new-espionage-focused-campaign-found-targeting-perimeter-network-devices/
- https://eclypsium.com/blog/cisco-asa-scanning-surge-cyberattack/
- https://www.cert.europa.eu/publications/threat-intelligence/tlr2024/pdf
- https://labs.withsecure.com/publications/mass-exploitation-the-vulnerable-edge-of-enterprise-security
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-20353
- https://5943619.hs-sites.com/hubfs/312-Year-in-Review/2026/Dragos-2026-OT-Cybersecurity-Report-A-Year-in-Review.pdf
- https://cert.europa.eu/publications/threat-intelligence/cb25-12/
- https://www.enisa.europa.eu/sites/default/files/2025-11/ENISA%20Public%20Administration%20TL%202024_0.pdf
- https://www.zscaler.com/blogs/security-research/cisco-firewall-and-vpn-zero-day-attacks-cve-2025-20333-and-cve-2025-20362
- https://ti.qianxin.com/uploads/2025/02/21/5c66fbda0feb2714c53f54dcedcd2e43.pdf
- https://insights.nccgroup.com/l/898251/2025-01-24/31knsst/898251/1737713506BZGVGklo/TI_Annual_Report_24_digital.pdf