Security readout for executives and security teams
Plain-English summary
This flaw can make a Symantec/Broadcom web proxy send one user’s web response to another user. For organizations using ASG or ProxySG 6.7 or 7.3, the business concern is accidental or attacker-induced exposure of sensitive web content moving through shared proxy infrastructure.
Executive priority
Treat this as a high-priority infrastructure exposure issue if ASG or ProxySG is in use. The main risk is confidentiality and integrity impact across users sharing proxy paths, not service outage.
Technical view
CVE-2021-46825 is an HTTP desync issue in Advanced Secure Gateway and ProxySG. A remote unauthenticated attacker, when sharing proxy-to-server traffic context with other clients, can send crafted HTTP requests that cause web server responses to be forwarded to unintended clients. The source reports CVSSv3 8.1 High.
Likely exposure
Exposure is most likely where Symantec Advanced Secure Gateway or ProxySG versions 6.7 or 7.3 proxy traffic for multiple web clients to the same web servers.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. The described attack is remote and unauthenticated, but depends on other clients communicating through the affected proxy with the same web server.
Researcher notes
Evidence is limited to the CVE description and Broadcom advisory URL. The bundle lacks CWE, detailed affected build ranges, fixed releases, detection signatures, and exploitation reports. Do not infer active exploitation or specific patches beyond vendor guidance.
Mitigation direction
- Review Broadcom’s advisory for affected builds and supported remediation guidance.
- Identify ASG and ProxySG deployments running 6.7 or 7.3.
- Prioritize remediation for shared proxy infrastructure handling sensitive authenticated web traffic.
- Reduce untrusted access to proxy services where operationally feasible.
- Monitor vendor channels for fixed versions or configuration-specific mitigations.
Validation and detection
- Inventory ASG and ProxySG versions across production and edge proxy environments.
- Compare discovered versions against Broadcom’s advisory scope.
- Confirm whether shared-client proxy paths reach common upstream web servers.
- Review proxy logs for unusual HTTP parsing, routing, or response-handling anomalies.
- Document any compensating controls and remaining exposed proxy paths.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-46825 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/20638CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.