CVE-2020-3259
Confirmed PUBLISHEDCisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Information Disclosure Vulnerability
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
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 retrieve memory contents on an affected device, which could lead to the disclosure of confidential information. The vulnerability is due to a buffer tracking issue when the software parses invalid URLs that are requested from the web services interface. An attacker could exploit this vulnerability by sending a crafted GET request to the web services interface. A successful exploit could allow the attacker to retrieve memory contents, which could lead to the disclosure of confidential information. Note: This vulnerability affects only specific AnyConnect and WebVPN configurations. For more information, see the Vulnerable Products section.
- CVE Published
- May 06, 2020
- Exploitation Reported
- Feb 15, 2024
- CVSS
- 7.5 High
- EPSS
- —
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| cisco |
firepower_threat_defense
|
6.2.3 to < 6.2.3.16 |
Affected |
| cisco |
firepower_threat_defense
|
6.3.0 to < 6.3.0.6 |
Affected |
| cisco |
firepower_threat_defense
|
6.4.0 to < 6.4.0.9 |
Affected |
| cisco |
firepower_threat_defense
|
6.5.0 to < 6.5.0.5 |
Affected |
| cisco |
adaptive_security_appliance_software
|
9.8 to < 9.8.4.20 |
Affected |
| cisco |
adaptive_security_appliance_software
|
9.9 to < 9.9.2..67 |
Affected |
| cisco |
adaptive_security_appliance_software
|
9.10 to < 9.10.1.40 |
Affected |
| cisco |
adaptive_security_appliance_software
|
9.12 to < 9.12.3.9 |
Affected |
| cisco |
adaptive_security_appliance_software
|
9.13 to < 9.13.1.10 |
Affected |
| Cisco |
Cisco Adaptive Security Appliance (ASA) Software
|
n/a |
Affected |
CVE References
- 20200506 Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Information Disclosure Vulnerability tools.cisco.com · Vendor Advisory https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory...
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 | 2024-02-15 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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Exploitation Status
Exploited in the wild
Recorded 2024-02-15 00:00:00 UTC · CISA
Used in malware
Recorded 2024-02-15 00:00:00 UTC · CISA
Weaknesses (CWE)
-
Exposure of Sensitive Information to an Unauthorized Actor
Scanner Integrations
| Scanner | Reference | Detected |
|---|---|---|
| Nessus | https://www.tenable.com/plugins/nessus/137659 | 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
-
00:00 UTC over 2 years ago00:00 UTC · over 2 years ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
00:00 UTC over 2 years ago00:00 UTC · over 2 years ago
First public exploitation report
Exploit observed in malware
-
16:41 UTC about 6 years ago16:41 UTC · about 6 years ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC over 6 years ago00:00 UTC · over 6 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-2020-3259
{
"cve_id": "CVE-2020-3259",
"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": null,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}