Symantec Advanced Secure Gateway (ASG) and ProxySG are susceptible to an HTTP desync…
Priority MEDIUM 43CWE-444Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
Symantec Advanced Secure Gateway (ASG) and ProxySG are susceptible to an HTTP desync vulnerability. When a remote unauthenticated attacker and other web clients communicate through the proxy with the same web server, the attacker can send crafted HTTP requests and cause the proxy to forward web server responses to unintended clients. Severity/CVSSv3: High / 8.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Why it matters now
EPSS 0.01682 77th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Advance Secure Gateway and ProxySG | 6.7, 7.3 | — | No fix listed | CNA |
- Advance Secure Gateway and ProxySG Vendor— Affected 6.7, 7.3 Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:broadcom:advanced_secure_gateway:6.7:*:*:*:*:*:*:* | 6.7 | Vulnerable | Broadcom |
| cpe:2.3:a:broadcom:advanced_secure_gateway:7.3:*:*:*:*:*:*:* | 7.3 | Vulnerable | Broadcom |
| cpe:2.3:a:broadcom:proxysg:6.7:*:*:*:*:*:*:* | 6.7 | Vulnerable | Broadcom |
| cpe:2.3:a:broadcom:proxysg:7.3:*:*:*:*:*:*:* | 7.3 | Vulnerable | Broadcom |
- cpe:2.3:a:broadcom:advanced_secure_gateway:6.7:*:*:*:*:*:*:* Versions 6.7 Vulnerable ·Broadcom
- cpe:2.3:a:broadcom:advanced_secure_gateway:7.3:*:*:*:*:*:*:* Versions 7.3 Vulnerable ·Broadcom
- cpe:2.3:a:broadcom:proxysg:6.7:*:*:*:*:*:*:* Versions 6.7 Vulnerable ·Broadcom
- cpe:2.3:a:broadcom:proxysg:7.3:*:*:*:*:*:*:* Versions 7.3 Vulnerable ·Broadcom
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-46825
- 2026-10-03 Alias added: GHSA-2h97-8375-29wg
References
More Broadcom Advanced Secure Gateway vulnerabilities
- TI-2023-09749 Command injection in Advanced Secure Gateway, Content Analysis CVSS 3.1CRITICAL 9.8
- TI-2018-03798 Symantec Advanced Secure Gateway (ASG) 6.6 and 6.7, and ProxySG 6.5, 6.6, and 6.7 are… CVSS 3.0CRITICAL 9.8
- TI-2017-09955 Denial-of-service (DoS) vulnerability in the Symantec Advanced Secure Gateway (ASG) and… CVSS 3.0HIGH 7.5
- TI-2023-09752 Server-side request forgery in Advanced Secure Gateway, Content Analysis CVSS 3.1HIGH 8.1
- TI-2016-08332 Unrestricted file upload in Symantec Advanced Secure Gateway CVSS 3.0MEDIUM 6.8
- TI-2016-07446 Access control flaw in Symantec Advanced Secure Gateway and ProxySG CVSS 3.0HIGH 7.2
Sources
- CVE-2021-46825 · CVE Program
- CVE-2021-46825 · NVD
- FIRST EPSS
- GHSA-2h97-8375-29wg · GitHub Advisory Database · CC BY 4.0
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