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Vulnerability record · CVE-2021-46825 · published 7 July 2022

CVE-2021-46825: Broadcom advanced secure gateway http request smuggling vulnerability

Broadcom · Advanced Secure Gateway

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

9.1 CVSS 3.1 Critical EPSS 1.6% · top 24.6% CWE-444 · HTTP request smuggling
9.1CVSS 3.1 base score, v2 6.4
1.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/20638 Vendor Advisory
https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/20638 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-23952Broadcom advanced secure gateway command injection vulnerabilityAdvanced Secure Gateway and Content Analysis, prior to 7.3.13.1 / 3.1.6.0, may be susceptible to a Command Injection vulnerability.EPSS 1.4%9.8CVE-2018-5241Broadcom advanced secure gateway vulnerabilitySymantec Advanced Secure Gateway (ASG) 6.6 and 6.7, and ProxySG 6.5, 6.6, and 6.7 are susceptible to a SAML authentication bypass vulnerability. The …EPSS 4.6%8.1CVE-2023-23955Broadcom advanced secure gateway server-side request forgery (ssrf) vulnerabilityAdvanced Secure Gateway and Content Analysis, prior to 7.3.13.1 / 3.1.6.0, may be susceptible to a Server-Side Request Forgery vulnerability.EPSS 0.47%7.8CVE-2023-23953Broadcom advanced secure gateway vulnerabilityAdvanced Secure Gateway and Content Analysis, prior to 7.3.13.1 / 3.1.6.0, may be susceptible to an Elevation of Privilege vulnerability.EPSS 0.19%7.8CVE-2016-9100Broadcom advanced secure gateway vulnerabilitySymantec Advanced Secure Gateway (ASG) 6.6 prior to 6.6.5.13, ASG 6.7 prior to 6.7.3.1, ProxySG 6.5 prior to 6.5.10.6, ProxySG 6.6 prior to 6.6.5.13,…EPSS 0.43%7.5CVE-2017-13677Broadcom advanced secure gateway vulnerabilityDenial-of-service (DoS) vulnerability in the Symantec Advanced Secure Gateway (ASG) and ProxySG management consoles. A remote attacker can use crafte…EPSS 5.0%7.2CVE-2016-9097Broadcom advanced secure gateway permissions and access controls vulnerabilityThe Symantec Advanced Secure Gateway (ASG) 6.6 prior to 6.6.5.8, ProxySG 6.5 prior 6.5.10.6, ProxySG 6.6 prior to 6.6.5.8, and ProxySG 6.7 prior to 6…EPSS 2.4%6.8CVE-2016-10258Broadcom advanced secure gateway unrestricted file upload vulnerabilityUnrestricted file upload vulnerability in the Symantec Advanced Secure Gateway (ASG) and ProxySG management consoles. A malicious appliance administr…EPSS 4.8%

Source: NIST National Vulnerability Database (record CVE-2021-46825), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.