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Fencer Vulns
critical 9.8

CVE-2021-30648 json

The Symantec Advanced Secure Gateway (ASG) and ProxySG web management consoles are susceptible to an authentication bypass vulnerability.

published 2021-06-30 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-17565

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 73%
public exploits
0
none known

Summary

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.

Patch / fix

  • broadcom symantec_proxysg 6.5.10.16, 6.6.5.19, 6.7.5.12, 7.2.7.2, 7.3.3.3
  • broadcom symantec_advanced_secure_gateway_s200-30_firmware 6.7.4.17, 6.7.5.12, 7.2.7.2, 7.3.3.3
  • broadcom symantec_advanced_secure_gateway_s200-40_firmware 6.7.4.17, 6.7.5.12, 7.2.7.2, 7.3.3.3
  • broadcom symantec_advanced_secure_gateway_s400-20_firmware 6.7.4.17, 6.7.5.12, 7.2.7.2, 7.3.3.3
  • broadcom symantec_advanced_secure_gateway_s400-30_firmware 6.7.4.17, 6.7.5.12, 7.2.7.2, 7.3.3.3
  • broadcom symantec_advanced_secure_gateway_s400-40_firmware 6.7.4.17, 6.7.5.12, 7.2.7.2, 7.3.3.3
  • broadcom symantec_advanced_secure_gateway_500-10_firmware 6.7.4.17, 6.7.5.12, 7.2.7.2, 7.3.3.3
  • broadcom symantec_advanced_secure_gateway_s500-20_firmware 6.7.4.17, 6.7.5.12, 7.2.7.2, 7.3.3.3

Exploit prediction

1.45% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 9.0 AV:N/AC:L/Au:N/C:P/I:P/A:C

Affected products

  • n/a Advanced Secure Gateway (ASG) and ProxySG

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.