CVE-2020-3259 (GCVE-0-2020-3259)
Vulnerability from cvelistv5 – Published: 2020-05-06 16:41 – Updated: 2026-08-12 03:56Title
Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Information Disclosure Vulnerability
Summary
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.
Severity
7.5 (High)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-02-14 00:00 UTC
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://tools.cisco.com/security/center/content/C… | vendor-advisoryx_refsource_CISCO |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
10 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Cisco | Cisco Adaptive Security Appliance (ASA) Software |
Affected:
n/a
|
guessed | |
| cisco | firepower_threat_defense |
Affected:
6.2.3 , < 6.2.3.16
(custom)
cpe:2.3:a:cisco:firepower_threat_defense:6.2.3:*:*:*:*:*:*:* |
||
| cisco | firepower_threat_defense |
Affected:
6.3.0 , < 6.3.0.6
(custom)
cpe:2.3:a:cisco:firepower_threat_defense:6.3.0:*:*:*:*:*:*:* |
||
| cisco | firepower_threat_defense |
Affected:
6.4.0 , < 6.4.0.9
(custom)
cpe:2.3:a:cisco:firepower_threat_defense:6.4.0:*:*:*:*:*:*:* |
||
| cisco | firepower_threat_defense |
Affected:
6.5.0 , < 6.5.0.5
(custom)
cpe:2.3:a:cisco:firepower_threat_defense:6.5.0:*:*:*:*:*:*:* |
||
| cisco | adaptive_security_appliance_software |
Affected:
9.8 , < 9.8.4.20
(custom)
cpe:2.3:a:cisco:adaptive_security_appliance_software:9.8:*:*:*:*:*:*:* |
||
| cisco | adaptive_security_appliance_software |
Affected:
9.9 , < 9.9.2..67
(custom)
cpe:2.3:a:cisco:adaptive_security_appliance_software:9.9:*:*:*:*:*:*:* |
||
| cisco | adaptive_security_appliance_software |
Affected:
9.10 , < 9.10.1.40
(custom)
cpe:2.3:a:cisco:adaptive_security_appliance_software:9.10:*:*:*:*:*:*:* |
||
| cisco | adaptive_security_appliance_software |
Affected:
9.12 , < 9.12.3.9
(custom)
cpe:2.3:a:cisco:adaptive_security_appliance_software:9.12:*:*:*:*:*:*:* |
||
| cisco | adaptive_security_appliance_software |
Affected:
9.13 , < 9.13.1.10
(custom)
cpe:2.3:a:cisco:adaptive_security_appliance_software:9.13:*:*:*:*:*:*:* |
Date Public
2020-05-06 00:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 615d2b31-bef2-41eb-a763-2ba326566de7
Exploited: Yes
Timestamps
First Seen: 2024-02-15
Asserted: 2024-02-15
Scope
Notes: KEV entry: Cisco ASA and FTD Information Disclosure Vulnerability | Affected: Cisco / Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) | Description: 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. | Due date: 2024-03-07 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-info-disclose-9eJtycMB; https://nvd.nist.gov/vuln/detail/CVE-2020-3259
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-200 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) |
| Due Date | 2024-03-07 |
| Date Added | 2024-02-15 |
| Vendorproject | Cisco |
| Vulnerabilityname | Cisco ASA and FTD Information Disclosure Vulnerability |
| Knownransomwarecampaignuse | Known |
References
Created: 2026-02-02 12:26 UTC
| Updated: 2026-02-06 07:17 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 11540ea5-319a-4526-8cf6-6044ea29861f
Exploited: Yes
Characteristics
Severity:
75.0
Timestamps
First Seen: 2025-07-12
Asserted: 2025-07-12
Last Seen: 2025-09-01
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Cisco / Cisco ASA and Cisco Firepower Threat Defense | Class: firewall | Severity: High (CVSS 7.5) | IoT: no | In CISA KEV: yes | Honeypot connections on 2025-09-01: 6
Evidence
Type: Honeypot
Signal: In The Wild Attempts
Confidence: 70%
Source: shadowserver
Details
| 1D | 2 |
|---|---|
| Iot | no |
| Feed | Shadowserver Foundation honeypot/exploited-vulnerabilities |
| Type | http-scan |
| Class | firewall |
| 7D Avg | 2 |
| Vendor | Cisco |
| 30D Avg | 0 |
| 90D Avg | 0 |
| Product | Cisco ASA and Cisco Firepower Threat Defense |
| Cisa Kev | yes |
| Connections | 6 |
| Observation Date | 2025-09-01 |
| Vulnerability Class | CVSS |
| Vulnerability Score | 7.5 |
| Vulnerability Severity | High |
References
Created: 2026-06-30 09:42 UTC
| Updated: 2026-06-30 11:39 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 6dd40703-b7ab-4c50-bf37-40023df9bbe8
Exploited: Yes
Timestamps
First Seen: 2024-02-15
Asserted: 2024-02-15
Scope
Notes: KEVIntel entry: Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Information Disclosure Vulnerability | Affected: Cisco / Cisco Adaptive Security Appliance (ASA) Software | CVSS: 7.5 (HIGH) | Used in malware: yes | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Confirmed Compromise
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Information Disclosure Vulnerability |
| Vendor | Cisco |
| Product | Cisco Adaptive Security Appliance (ASA) Software |
| Added Date | 2024-02-15T00:00:00.000Z |
| Cvss Score | 7.5 |
| Epss Score | None |
| Cvss Severity | HIGH |
| Epss Percentile | None |
| Used In Malware | yes |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-23 14:05 UTC
| Updated: 2026-07-10 06:14 UTC
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"time": "2024-02-15T00:00:00.000Z",
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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