CVE-2016-9099: Symantec Advanced Secure Gateway (ASG) 6.6, ASG 6.7 prior to 6.7.2.1, ProxySG 6.5 prior to 6.5.10.6, ProxySG 6

This month

MEDIUM 6.1UPGRADEUPGRADE

CVE-2016-9099 is a medium-severity flaw (CVSS 6.1) affecting advanced secure gateway, symantec proxysg. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Symantec Advanced Secure Gateway (ASG) 6.6, ASG 6.7 prior to 6.7.2.1, ProxySG 6.5 prior to 6.5.10.6, ProxySG 6.6, and ProxySG 6.7 prior to 6.7.2.1 are susceptible to an open redirection vulnerability. A remote attacker can use a crafted management console URL in a phishing attack to redirect the target user to a malicious web site.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.8% (top 21%)
CISA exploited list	No
Weakness	CWE-601
Published	2017-05-11
Last modified	2026-06-17

Publisher (CNA): Symantec Corporation · Vendor: broadcom

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-05-11 14:30 UTCPublished CVE record published
2026-06-17 00:55 UTCUpdated Record last modified

broadcom advanced secure gateway UPGRADE

Affected: >= 6.7 and < 6.7.2.1 · 6.6

Fixed in: 6.7.2.1

Safe to downgrade to: a release before 6.6

1. Check installed version

apt-cache policy advanced-secure-gateway || rpm -q advanced-secure-gateway || advanced-secure-gateway --version

2. UPGRADE to 6.7.2.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade advanced-secure-gateway

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade advanced-secure-gateway

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 6.6 (Debian / Ubuntu)

apt-cache madison advanced-secure-gateway sudo apt install advanced-secure-gateway=<VERSION_BEFORE_6.6> sudo apt-mark hold advanced-secure-gateway

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list advanced-secure-gateway sudo dnf downgrade advanced-secure-gateway-<VERSION_BEFORE_6.6> sudo dnf versionlock add advanced-secure-gateway

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

broadcom symantec proxysg UPGRADE

Affected: >= 6.5 and < 6.5.10.6 · 6.6 · >= 6.7 and < 6.7.2.1

Fixed in: 6.5.10.6, 6.7.2.1

Safe to downgrade to: a release before 6.5

1. Check installed version

apt-cache policy symantec-proxysg || rpm -q symantec-proxysg || symantec-proxysg --version

2. UPGRADE to 6.5.10.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade symantec-proxysg

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade symantec-proxysg

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 6.5 (Debian / Ubuntu)

apt-cache madison symantec-proxysg sudo apt install symantec-proxysg=<VERSION_BEFORE_6.5> sudo apt-mark hold symantec-proxysg

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list symantec-proxysg sudo dnf downgrade symantec-proxysg-<VERSION_BEFORE_6.5> sudo dnf versionlock add symantec-proxysg

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2016-9099?

advanced secure gateway: upgrade to 6.7.2.1; symantec proxysg: upgrade to 6.5.10.6, 6.7.2.1. Exact commands for each OS are on this page.

Is CVE-2016-9099 being exploited?

CVE-2016-9099 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2016-9099 affect?

CVE-2016-9099 affects advanced secure gateway, symantec proxysg. Severity is medium (CVSS 6.1). Symantec Advanced Secure Gateway (ASG) 6.6, ASG 6.7 prior to 6.7.2.1, ProxySG 6.5 prior to 6.5.10.6, ProxySG 6.6, and ProxySG 6.7 prior to 6.7.2.1 are susceptible to an open redirection vulnerability. A remote attacker can use a crafted man

How urgent is CVE-2016-9099?

Priority 41/100. No elevated risk signals yet.

Software pages

Symantec and Broadcom vulnerabilities

Related CVEs

CVE-2023-23955 HIGH 8.1 UPGRADE UPGRADE Advanced Secure Gateway and Content Analysis, prior to 7.3.13.1 / 3.1.6.0, may be susceptible to a Server-Side
CVE-2023-23954 MEDIUM 5.4 UPGRADE UPGRADE Advanced Secure Gateway and Content Analysis, prior to 7.3.13.1 / 3.1.6.0, may be susceptible to a Stored Cros
CVE-2023-23953 HIGH 7.8 UPGRADE UPGRADE Advanced Secure Gateway and Content Analysis, prior to 7.3.13.1 / 3.1.6.0, may be susceptible to an Elevation
CVE-2023-23952 CRITICAL 9.8 UPGRADE UPGRADE Advanced Secure Gateway and Content Analysis, prior to 7.3.13.1 / 3.1.6.0, may be susceptible to a Command Inj
CVE-2021-46825 CRITICAL 9.1 DOWNGRADE DOWNGRADE Symantec Advanced Secure Gateway (ASG) and ProxySG are susceptible to an HTTP desync vulnerability

References

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