high Known exploitedREV. 01
CVE-2024-20359Cisco firewalls — an implant that survives the reboot
A legacy preload path in Cisco's firewall software (ASA and FTD) reads a file from flash storage without validating it, so an administrator can plant code that runs after the next reload and persists across reboots. Espionage crews used it.
Read the risk
THE VITAL STATS- CVSS score
- 6.0/ 10 CVSS v3.1
- EPSS probability
- 19% Likelihood of exploitation
- Attack complexity
- Low Conditions needed to exploit
- Known exploited
- Yes — CISA KEV
- CVE published
- 2024-04-24
- Added to KEV
- 2024-04-24
- Exploit published
- Yes
- Confidence
- high
- Kill chain
- persistence
- MITRE ATT&CK
- T1059
- Severity
- high
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Attacker needsThe attacker must already hold administrator access to the device.
Behind the card
4 REFERENCES- 01CVE recordNVD recordnvd.nist.gov
- 02CISACISA Known Exploited Vulnerabilities catalogcisa.gov
- 03Vendor advisorysec.cloudapps.cisco.comsec.cloudapps.cisco.com
- 04Exploitblog.talosintelligence.comblog.talosintelligence.com
Field-level provenanceTRACE THE SOURCES +
Which source supports each field, when it was retrieved, and who extracted it.
| Fields | Source | Retrieved | Extractor | Confidence |
|---|---|---|---|---|
| cvss, exploitation.attack_complexity, exploitation.exploit_available, references, published_at | nvd.nist.gov | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| exploitation.known_exploited, exploitation.kev_added | cisa.gov | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| epss | api.first.org | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| title, summary, severity, remediation, mitre_attack, kill_chain, recommended_action, confidence, tags, exploitation.prerequisites | nvd.nist.gov | 2026-09-24 | claude-code | high |
Printing history
THE RECORD- r1Initial base card
First printing. This card has not been reprinted since publication.