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Vulnerability record · CVE-2018-5241 · published 29 May 2018

CVE-2018-5241: Broadcom advanced secure gateway vulnerability

Broadcom · Advanced Secure Gateway

Symantec 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 products can be configured with a SAML authentication realm to authenticate network users in intercepted proxy traffic. When parsing SAML responses, ASG and ProxySG incorrectly handle XML nodes with comments. A remote attacker can modify a valid SAML response without invalidating its cryptographic signature. This may allow the attacker to bypass user authentication security controls in ASG and ProxySG. This vulnerability only affects authentication of network users in intercepted traffic. It does not affect administrator user authentication for the ASG and ProxySG management consoles.

9.8 CVSS 3.0 Critical EPSS 4.6% · top 8.6%
9.8CVSS 3.0 base score, v2 7.5
4.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

Symantec 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 products can be configured with a SAML authentication realm to authenticate network users in intercepted proxy traffic. When parsing SAML responses, ASG and ProxySG incorrectly handle XML nodes with comments. A remote attacker can modify a valid SAML response without invalidating its cryptographic signature. This may allow the attacker to bypass user authentication security controls in ASG and ProxySG. This vulnerability only affects authentication of network users in intercepted traffic. It does not affect administrator user authentication for the ASG and ProxySG management consoles.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

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

References

LinkTags
http://www.securityfocus.com/bid/104282 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1040993 Third Party AdvisoryVDB Entry
https://www.symantec.com/security-center/network-protection-security-advisories/SA167 Vendor Advisory
http://www.securityfocus.com/bid/104282 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1040993 Third Party AdvisoryVDB Entry
https://www.symantec.com/security-center/network-protection-security-advisories/SA167 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-2021-30648Broadcom symantec proxysg improper authentication vulnerabilityThe Symantec Advanced Secure Gateway (ASG) and ProxySG web management consoles are susceptible to an authentication bypass vulnerability. An unauthen…EPSS 1.4%9.1CVE-2021-46825Broadcom advanced secure gateway http request smuggling vulnerabilitySymantec Advanced Secure Gateway (ASG) and ProxySG are susceptible to an HTTP desync vulnerability. When a remote unauthenticated attacker and other …EPSS 1.6%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%

Source: NIST National Vulnerability Database (record CVE-2018-5241), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.