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CVE-2020-3259

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Information Disclosure Vulnerability

HIGH
7.5
CVSS Score
Published: May 6, 2020 at 04:41 PM UTC
Updated: August 12, 2026 at 05:17 AM UTC
3 products affected across 1 vendorAdaptive Security ApplianceSecure Firewall Threat DefenseFirepower Threat Defense

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Severity
HIGH7.5
Exploitation
CISA KEV
Exploit prediction
EPSS 72%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score71.5%

EPSS (Exploit Prediction Scoring System) estimates a 71.5% chance this CVE is exploited in the wild within the next 30 days — higher than 99% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an information disclosure vulnerability. An attacker could retrieve memory contents on an affected device, which could lead to the disclosure of confidential information due to a buffer tracking issue when the software parses invalid URLs that are requested from the web services interface. This vulnerability affects only specific AnyConnect and WebVPN configurations.

Required Action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Ransomware Use
Known
Added to KEV
Feb 15, 2024
Remediation Due
Mar 7, 2024
965 days overdue
Notes
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-info-disclose-9eJtycMB
https://nvd.nist.gov/vuln/detail/CVE-2020-3259

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Adaptive Security Appliance· Cisco
95%
9.10 ≤ v < 9.10.1.409.12 ≤ v < 9.12.3.99.13 ≤ v < 9.13.1.109.8 ≤ v < 9.8.4.209.9 ≤ v < 9.9.2..679.9 ≤ v < 9.9.2.679.109.129.139.89.9
Affected range stops below 9.10.1.40, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.12.3.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.13.1.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.8.4.20, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.9.2.67, so it looks safe — our inference, not a vendor statement
Firepower Threat Defense· Cisco
95%
6.2.3 ≤ v < 6.2.3.166.3.0 ≤ v < 6.3.0.66.4.0 ≤ v < 6.4.0.96.5.0 ≤ v < 6.5.0.56.2.36.3.06.4.06.5.0
Affected range stops below 6.2.3.16, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.3.0.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.4.0.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.5.0.5, so it looks safe — our inference, not a vendor statement
Secure Firewall Threat Defense· Cisco
95%
6.2.3 ≤ v < 6.2.3.166.3.0 ≤ v < 6.3.0.66.4.0 ≤ v < 6.4.0.96.5.0 ≤ v < 6.5.0.5
Affected range stops below 6.2.3.16, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.3.0.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.4.0.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.5.0.5, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisoryx_refsource_CISCO
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-info-disclose-9eJtycMB
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3259

SSVC — Action Prioritization

SSVCActiveAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-200NVD-CWE-noinfo

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