cve-2025-20333
CRITICAL CVSS 9.9 nvd
Description
A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker with valid VPN user credentials could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of the affected device.
Timeline
- Published
- 2025-09-25
- Last Modified
- 2026-10-18
CVSS Details
- Attack Vector
- NETWORK
- Attack Complexity
- LOW
- Privileges Required
- LOW
Affected Products
- cisco adaptive_security_appliance_software
- cisco secure_firewall_threat_defense
CISA KEV — Known Exploited Vulnerability
- Name
- Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability
- Added to KEV
- 2025-09-25
- Action due
- 2025-09-26
- Required action
- The KEV due date refers to the deadline by which FCEB agencies are expected to review and begin implementing the guidance outlined in Emergency Directive (ED) 25-03 (URL listed below in Notes). Agencies must follow the mitigation steps provided by CISA (URL listed below in Notes) and vendor’s instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
Weaknesses (CWE)
CVSS metrics
| Version | Base | Severity | Vector | Exploitability | Impact | Source |
|---|---|---|---|---|---|---|
| 3.1 | 9.9 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
3.1 | 6.0 | psirt@cisco.com |
CPE configurations
OR
| CPE | Version range | Vulnerable |
|---|---|---|
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* |
>= 9.12, < 9.12.4.72 | yes |
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* |
>= 9.14, < 9.14.4.28 | yes |
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* |
>= 9.16, < 9.16.4.85 | yes |
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* |
>= 9.17.0, < 9.17.1.45 | yes |
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* |
>= 9.18, < 9.18.4.47 | yes |
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* |
>= 9.19, < 9.19.1.37 | yes |
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* |
>= 9.20, < 9.20.3.7 | yes |
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* |
>= 9.22, < 9.22.1.3 | yes |
OR
| CPE | Version range | Vulnerable |
|---|---|---|
cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:* |
>= 7.0.0, < 7.0.8.1 | yes |
cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:* |
>= 7.1.0, < 7.2.9 | yes |
cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:* |
>= 7.3.0, < 7.4.2.4 | yes |
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.6.0:*:*:*:*:*:*:* |
— | yes |
NVD metadata
- NVD status
- Analyzed
- Source identifier
psirt@cisco.com
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-z5xP8EUB Vendor Advisory
- https://sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-20333 US Government Resource
Linked Vulnerabilities
No linked vulnerabilities found.
{
"cvss": 9.9,
"datePublished": "2025-09-25T16:15:32.073",
"dateUpdated": "2026-10-18T21:10:00.120",
"description": "A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to execute arbitrary code on an affected device.\r\n\r This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker with valid VPN user credentials could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of the affected device.",
"id": "CVE-2025-20333",
"raw": {
"affected": [
{
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{
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{
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{
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{
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{
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{
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
"version": "9.17.1.10"
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{
"status": "affected",
"version": "9.17.1.11"
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{
"status": "affected",
"version": "9.17.1.13"
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{
"status": "affected",
"version": "9.17.1.15"
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{
"status": "affected",
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{
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{
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{
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"version": "9.17.1.39"
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{
"status": "affected",
"version": "9.18.1"
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{
"status": "affected",
"version": "9.18.1.3"
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{
"status": "affected",
"version": "9.18.2"
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{
"status": "affected",
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{
"status": "affected",
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{
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"version": "9.18.2.8"
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{
"status": "affected",
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{
"status": "affected",
"version": "9.18.3.39"
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
"status": "affected",
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{
"status": "affected",
"version": "9.18.4.40"
},
{
"status": "affected",
"version": "9.19.1"
},
{
"status": "affected",
"version": "9.19.1.5"
},
{
"status": "affected",
"version": "9.19.1.9"
},
{
"status": "affected",
"version": "9.19.1.12"
},
{
"status": "affected",
"version": "9.19.1.18"
},
{
"status": "affected",
"version": "9.19.1.22"
},
{
"status": "affected",
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},
{
"status": "affected",
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{
"status": "affected",
"version": "9.19.1.28"
},
{
"status": "affected",
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{
"status": "affected",
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},
{
"status": "affected",
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},
{
"status": "affected",
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},
{
"status": "affected",
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},
{
"status": "affected",
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},
{
"status": "affected",
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{
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{
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]
},
{
"product": "Cisco Secure Firewall Threat Defense (FTD) Software",
"vendor": "Cisco",
"versions": [
{
"status": "affected",
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},
{
"status": "affected",
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},
{
"status": "affected",
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},
{
"status": "affected",
"version": "6.2.3.3"
},
{
"status": "affected",
"version": "6.2.3.4"
},
{
"status": "affected",
"version": "6.2.3.5"
},
{
"status": "affected",
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},
{
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},
{
"status": "affected",
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},
{
"status": "affected",
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},
{
"status": "affected",
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},
{
"status": "affected",
"version": "6.2.3.9"
},
{
"status": "affected",
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},
{
"status": "affected",
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},
{
"status": "affected",
"version": "6.2.3.14"
},
{
"status": "affected",
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},
{
"status": "affected",
"version": "6.2.3.16"
},
{
"status": "affected",
"version": "6.2.3.17"
},
{
"status": "affected",
"version": "6.2.3.18"
},
{
"status": "affected",
"version": "6.6.0"
},
{
"status": "affected",
"version": "6.6.0.1"
},
{
"status": "affected",
"version": "6.6.1"
},
{
"status": "affected",
"version": "6.6.3"
},
{
"status": "affected",
"version": "6.6.4"
},
{
"status": "affected",
"version": "6.6.5"
},
{
"status": "affected",
"version": "6.6.5.1"
},
{
"status": "affected",
"version": "6.6.5.2"
},
{
"status": "affected",
"version": "6.6.7"
},
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Enrichment data
Aggregated bundle (all enrichments)