CVE-2020-3452
This CVE is being exploited. Apply the vendor fix, or take the service off the internet until you can, then check your logs for attempts.
What it is
A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct directory traversal attacks and read sensitive files on a targeted system. The vulnerability is due to a lack of proper input validation of URLs in HTTP requests processed by an affected device. An attacker could exploit this vulnerability by sending a crafted HTTP request containing directory traversal character sequences to an affected device. A successful exploit could allow the attacker to view arbitrary files within the web services file system on the targeted device. The web services file system is enabled when the affected device is configured with either WebVPN or AnyConnect features. This vulnerability cannot be used to obtain access to ASA or FTD system files or underlying operating system (OS) files.
Live exploitation on the huntback network (30 days)
Detection
Evidence
Confirmed exploited. Our decoys saw 30 exploitation attempts in the last 14 days; CISA added it to KEV 1835 days ago.
Last attempt. 91 attempts on our decoys, 30 in the last 14 days
First exploitation attempt on our decoys
Added to CISA Known Exploited Vulnerabilities
Published
Exploit code published (ExploitDB)
Nuclei detection template available
Observed: our own decoys saw it. Reported: CISA, the vendor or another named source says so. Weaponised: public exploit code or a scanner template exists. Methodology
Questions
Is CVE-2020-3452 being exploited in the wild?
Yes. The huntback decoy network captured 91 exploitation attempts from 62 distinct source IPs; the most recent was on 2026-11-11. It is also in the CISA KEV catalogue.
Can CVE-2020-3452 be detected on the network?
Yes. huntback carries a network signature for CVE-2020-3452, so attempts against a decoy are tagged in real time.
How huntback helps
Deploy a decoy that emulates Adaptive Security Appliance Software and you will see every attempt at this CVE the moment it lands, with the full payload, the attacker's infrastructure, and any stage-2 loader. Then huntback can scan the attacker back.
Related
NVD record → Browse all CVEs → Live malware and C2 finds → Novel-attack discovery → Deploy a decoy →API
This record, with its evidence timeline, as JSON:
curl -H "X-API-Key: $HUNTBACK_KEY" https://app.huntback.io/api/v1/evidence/CVE-2020-3452