CVE-2020-3452

Confirmed PUBLISHED

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Read-Only Path Traversal Vulnerability

Vendor: Cisco Product: Cisco Adaptive Security Appliance (ASA) Software

Exploited in the wild Active exploitation observed PoC available

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Confidence

Confirmed

Exploitation Status

Active exploitation observed

Observed in Sensors

Yes

Attempts (30d)

Unique Attacker IPs

CISA KEV

In CISA KEV

CVSS / EPSS

7.5 High EPSS 100.0%

At a Glance

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.

edge cisa nuclei_scanner

CVE Published: Jul 22, 2020
Exploitation Reported: Nov 03, 2021
CVSS: 7.5 High
EPSS: 100.0%

Remote Low complexity No user interaction Unauthenticated

Sensor telemetry available

Affected Versions

Vendor	Product	Version	Status
Cisco	Cisco Adaptive Security Appliance (ASA) Software	unspecified to < 9.6.4.42	Affected
Cisco	Cisco Adaptive Security Appliance (ASA) Software	unspecified to < 9.8.4.20	Affected
Cisco	Cisco Adaptive Security Appliance (ASA) Software	unspecified to < 9.9.2.74	Affected
Cisco	Cisco Adaptive Security Appliance (ASA) Software	unspecified to < 9.10.1.42	Affected
Cisco	Cisco Adaptive Security Appliance (ASA) Software	unspecified to < 9.13.1.10	Affected
Cisco	Cisco Adaptive Security Appliance (ASA) Software	unspecified to < 9.14.1.10	Affected

CVE References

20200722 Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Read-Only Path Traversal Vulnerability tools.cisco.com · Vendor Advisory https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory...
packetstormsecurity.com/files/158646/Cisco-ASA-FTD-Remote-File-Discl... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/158646/Cisco-ASA-FTD-Remote-File...
packetstormsecurity.com/files/158647/Cisco-Adaptive-Security-Applian... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/158647/Cisco-Adaptive-Security-A...
packetstormsecurity.com/files/159523/Cisco-ASA-FTD-9.6.4.42-Path-Tra... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/159523/Cisco-ASA-FTD-9.6.4.42-Pa...
packetstormsecurity.com/files/160497/Cisco-ASA-9.14.1.10-FTD-6.6.0.1... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/160497/Cisco-ASA-9.14.1.10-FTD-6...

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.

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Source	Added
CISA First	2021-11-03 00:00 UTC
The Shadowserver	2026-06-01 00:00 UTC
KEVIntel	2026-07-27 14:23 UTC

Operational indicators for this CVE are listed on the Detection tab.

Indicators of Compromise (IoCs)

Attacker IP IoCs observed in KEVIntel sensors are available to Pro and Enterprise accounts on the Detection tab and through the Pro API.

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Observed Detection Signals (30d)

Aggregate counts from KEVIntel sensor telemetry for this CVE.

Distinct request paths: 2
Distinct User-Agents: 14

The specific request paths and User-Agents attackers are using are available on Pro and Enterprise plans.

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Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner	Reference	Detected
Nuclei	https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2020/CVE-2020-3452.yaml	Apr 25, 2025

CVSS Scores

CVSS v3.1 7.5 High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v2.0 5.0 Medium

AV:N/AC:L/Au:N/C:P/I:N/A:N

Exploitation Status

Exploited in the wild

Recorded 2021-11-03 00:00:00 UTC · CISA

Active exploitation observed

Recorded 2026-06-29 18:59:44 UTC · KEVIntel sensor

Proof of concept available

Recorded 2020-07-24 00:39:11 UTC · GitHub

Weaknesses (CWE)

CWE-20

Improper Input Validation
CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Scanner Integrations

Nuclei, Metasploit, and other scanner references for this CVE are listed on the Detection tab.

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

Aviksaikat/CVE-2020-3452

github · Created 2021-11-03 07:27:14 UTC · 1 stars

Test vulnerability of CVE-2020-3452

sujaygr8/CVE-2020-3452

github · Created 2021-06-10 05:09:52 UTC · 0 stars

faisalfs10x/Cisco-CVE-2020-3452-shodan-scanner

github · Created 2021-02-04 16:50:27 UTC · 1 stars

simple bash script of CVE-2020-3452 Cisco ASA / Firepower Read-Only Path Traversal Vulnerability checker

darklotuskdb/CISCO-CVE-2020-3452-Scanner-Exploiter

github · Created 2021-01-05 14:41:13 UTC · 99 stars

CISCO CVE-2020-3452 Scanner & Exploiter

cygenta/CVE-2020-3452

github · Created 2020-12-13 13:47:38 UTC · 26 stars

grim3/CVE-2020-3452

github · Created 2020-11-18 21:31:50 UTC · 4 stars

CVE-2020-3452

3ndG4me/CVE-2020-3452-Exploit

github · Created 2020-09-28 05:00:37 UTC · 24 stars

Just basic scanner abusing CVE-2020-3452 to enumerate the standard files accessible in the Web Directory of the CISCO ASA applicances.

murataydemir/CVE-2020-3452

github · Created 2020-08-13 08:22:27 UTC · 7 stars

[CVE-2020-3452] Cisco Adaptive Security Appliance (ASA) & Cisco Firepower Threat Defense (FTD) Web Service Read-Only Directory Traversal

0x5ECF4ULT/CVE-2020-3452

github · Created 2020-08-01 08:27:11 UTC · 24 stars

CVE-2020-3452 exploit

foulenzer/CVE-2020-3452

github · Created 2020-07-25 16:11:55 UTC · 3 stars

Little, stupid python validator(?) for CVE-2020-3452 on CISCO devices.

mr-r3b00t/CVE-2020-3452

github · Created 2020-07-24 16:26:52 UTC · 0 stars

PR3R00T/CVE-2020-3452-Cisco-Scanner

github · Created 2020-07-24 15:04:45 UTC · 25 stars

CVE-2020-3452 Cisco ASA Scanner -unauth Path Traversal Check

XDev05/CVE-2020-3452-PoC

github · Created 2020-07-24 00:39:11 UTC · 2 stars

Cisco Adaptive Security Appliance (ASA)/Firepower Threat Defense (FTD) - Local File Inclusion

nuclei · Created Unknown

Timeline

Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.

29 Jun 2026 18:59 UTC 29 days ago

29 Jun 2026 18:59 UTC · 29 days ago

Observed by KEVIntel sensors

Evidence-backed exploitation signal
29 Jun 2026 18:59 UTC 29 days ago

29 Jun 2026 18:59 UTC · 29 days ago

Indicators of compromise added (74)

Indicators of compromise recorded
1 Jun 2026 00:00 UTC about 2 months ago

1 Jun 2026 00:00 UTC · about 2 months ago

KEV confirmed by The Shadowserver

Exploitation attested by an external source
25 Apr 2025 00:00 UTC over 1 year ago

25 Apr 2025 00:00 UTC · over 1 year ago

Nuclei template available

Scanner coverage available
3 Nov 2021 00:00 UTC over 4 years ago

3 Nov 2021 00:00 UTC · over 4 years ago

Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
24 Jul 2020 00:39 UTC about 6 years ago

24 Jul 2020 00:39 UTC · about 6 years ago

Public PoC available

Public proof-of-concept code published
22 Jul 2020 20:00 UTC about 6 years ago

22 Jul 2020 20:00 UTC · about 6 years ago

CVE published

Vulnerability disclosed publicly
12 Dec 2019 00:00 UTC over 6 years ago

12 Dec 2019 00:00 UTC · over 6 years ago

CVE ID reserved

Identifier reserved by the CNA

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Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Pro API Example

GET /api/v2/pro/kevs/CVE-2020-3452

{
  "cve_id": "CVE-2020-3452",
  "title": "Cisco Adaptive Security Appliance Software and Firepower Threat Defense Softw...",
  "affected_vendor": "Cisco",
  "affected_product": "Cisco Adaptive Security Appliance (ASA) Software",
  "affected_versions": [
    { "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
  ],
  "confidence": "Confirmed",
  "cvss_score": 7.5,
  "epss_score": 0.99992,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "...": "Pro API fields" },
  "proof_of_concepts": [ "..." ],
  "scanner_integrations": [ "..." ]
}

The free JSON API returns basic KEV fields only. Confidence, telemetry, and artifact enrichment require Pro API access.

CVE-2020-3452

At a Glance

Affected Versions

CVE References

Known Exploited Vulnerability Sources

Observed Exploitation Attempts

Exploitation Attempts Over the Last 31 Days

See more exploitation detail

Indicators of Compromise (IoCs)

Observed Detection Signals (30d)

Scanner Artifacts

Virtual Patch

CVSS Scores

Exploitation Status

Weaknesses (CWE)

Scanner Integrations

Potential Proof of Concepts

Timeline

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