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CVE Record

CVE-2021-30648: The Symantec Advanced Secure Gateway (ASG) and ProxySG web management consoles are susceptible to an authen...

The Symantec Advanced Secure Gateway (ASG) and ProxySG web management consoles are susceptible to an authentication bypass vulnerability. An unauthenticated attacker can execute arbitrary CLI commands, view/modify the appliance configuration and policy, and shutdown/restart the appliance.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

This flaw can let an unauthenticated person take over the web management console of affected Symantec ASG and ProxySG appliances. The reported impact includes running CLI commands, changing security policy and configuration, and restarting or shutting down the appliance.

Executive priority

Prioritize urgently for any affected appliance that is reachable beyond a tightly controlled admin network. This is a security-control compromise risk, not only an appliance availability issue.

Technical view

CVE-2021-30648 is an authentication bypass in the Symantec Advanced Secure Gateway and ProxySG web management consoles. The source bundle states unauthenticated attackers can execute arbitrary CLI commands and view or modify appliance configuration and policy. Affected release ranges are listed for ASG 6.6, 6.7, 7.2, 7.3 and ProxySG 6.5, 6.6, 6.7, 7.2, 7.3.

Likely exposure

Exposure is most likely where affected ASG or ProxySG management consoles are reachable by untrusted networks or poorly segmented internal networks. Internet exposure would materially increase urgency, but the supplied sources do not confirm how commonly these consoles are exposed.

Exploitation context

The bundle does not show CISA KEV status and provides no cited evidence of active exploitation. The vulnerability is still high consequence because authentication bypass leads to administrative command and configuration control on security gateway appliances.

Researcher notes

No CVSS vector, CWE, or exploit evidence is included in the supplied bundle. Analysis is based on the CVE description, affected-version statement, KEV=false signal, and Broadcom advisory reference.

Mitigation direction

  • Upgrade affected ASG and ProxySG releases to Broadcom fixed versions named in SYMSA18331.
  • Check Broadcom advisory SYMSA18331 for product-specific remediation guidance.
  • Restrict management console access to trusted administrative networks only.
  • Review appliance configuration and policy integrity after remediation.

Validation and detection

  • Inventory ASG and ProxySG appliances and record exact software versions.
  • Confirm whether each management console is reachable from untrusted networks.
  • Compare versions against the affected ranges in the CVE record.
  • Review recent administrative logs for unexpected configuration or CLI activity.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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

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description · low confidence lookup

Credential and access behavior lookup

The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2021-30648 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/aAdvanced Secure Gateway (ASG) and ProxySGASG 6.6, ASG 6.7 prior to 6.7.4.17 or 6.7.5.12, ASG 7.2 prior to 7.2.7.2, ASG 7.3 prior to 7.3.3.3, ProxySG 6.5 prior to 6.5.10.16, ProxySG 6.6 prior to 6.6.5.19, ProxySG 6.7 prior to 6.7.3.15, 6.7.4.17, or 6.7.5.12, ProxySG 7.2 prior 7.2.7.2, ProxySG 7.3 prior to 7.3.3.3.Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.