CVE-2016-5774: The HTTPS server in Blue Coat PacketShaper S-Series 11.5.x before 11.5.3.2 might allow remote attackers to obt

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HIGH 8.1REMOTEDOWNGRADE

CVE-2016-5774 is a high-severity flaw (CVSS 8.1) affecting packetshaper s-series. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The HTTPS server in Blue Coat PacketShaper S-Series 11.5.x before 11.5.3.2 might allow remote attackers to obtain sensitive credentials and other information via unspecified vectors, related to use of insecure cryptographic parameters.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-310
Published	2016-07-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: blue coat

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

Am I affected?

Timeline

2016-07-12 19:59 UTCPublished CVE record published
2026-06-17 00:50 UTCUpdated Record last modified

blue coat packetshaper s-series DOWNGRADE

Affected: 11.5.1 · 11.5.1.2 · 11.5.1.3 · 11.5.2 · 11.5.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.5.1

1. Check installed version

apt-cache policy packetshaper-s-series || rpm -q packetshaper-s-series || packetshaper-s-series --version

2. No fixed release: DOWNGRADE to a release before 11.5.1 (Debian / Ubuntu)

apt-cache madison packetshaper-s-series sudo apt install packetshaper-s-series=<VERSION_BEFORE_11.5.1> sudo apt-mark hold packetshaper-s-series

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list packetshaper-s-series sudo dnf downgrade packetshaper-s-series-<VERSION_BEFORE_11.5.1> sudo dnf versionlock add packetshaper-s-series

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-2016-5774?

packetshaper s-series: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2016-5774 being exploited?

CVE-2016-5774 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-2016-5774 affect?

CVE-2016-5774 affects packetshaper s-series. Severity is high (CVSS 8.1). The HTTPS server in Blue Coat PacketShaper S-Series 11.5.x before 11.5.3.2 might allow remote attackers to obtain sensitive credentials and other information via unspecified vectors, related to use of insecure cryptographic parameters.

How urgent is CVE-2016-5774?

Priority 50/100. High severity; Remotely exploitable, no login, no user action

References

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