CVE-2010-5144: The ISAPI Filter plug-in in Websense Enterprise, Websense Web Security, and Websense Web Filter 6.3.3 and earl

Q: How do I fix CVE-2010-5144?

websense: upgrade to newer than 6.3.3; websense web security: downgrade or apply the listed mitigation; websense web filter: upgrade to newer than 6.3.3. Exact commands for each OS are on this page.

Q: Is CVE-2010-5144 being exploited?

CVE-2010-5144 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2010-5144 affect?

CVE-2010-5144 affects websense, websense web security, websense web filter. Severity is medium (CVSS 4.3). The ISAPI Filter plug-in in Websense Enterprise, Websense Web Security, and Websense Web Filter 6.3.3 and earlier, when used in conjunction with a Microsoft ISA or Microsoft Forefront TMG server, allows remote attackers to bypass intended f

Q: How urgent is CVE-2010-5144?

Priority 39/100. Public exploit reference

Routine

MEDIUM 4.3UPGRADEDOWNGRADEUPGRADE

CVE-2010-5144 is a medium-severity flaw (CVSS 4.3) affecting websense, websense web security, websense web filter. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The ISAPI Filter plug-in in Websense Enterprise, Websense Web Security, and Websense Web Filter 6.3.3 and earlier, when used in conjunction with a Microsoft ISA or Microsoft Forefront TMG server, allows remote attackers to bypass intended filtering and monitoring activities for web traffic via an HTTP Via header.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-264
Published	2012-08-23
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: websense

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2012-08-23 10:32 UTCPublished CVE record published
2026-06-16 23:26 UTCUpdated Record last modified

websense websense UPGRADE

Affected: <= 6.3.3 · 6.3.0 · 6.3.1

Fixed in: newer than 6.3.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy websense || rpm -q websense || websense --version

2. UPGRADE to newer than 6.3.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade websense

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade websense

Note

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

websense websense web security DOWNGRADE

Affected: 6.3.0 · 6.3.1 · 6.3.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.3.0

1. Check installed version

apt-cache policy websense-web-security || rpm -q websense-web-security || websense-web-security --version

2. No fixed release: DOWNGRADE to a release before 6.3.0 (Debian / Ubuntu)

apt-cache madison websense-web-security sudo apt install websense-web-security=<VERSION_BEFORE_6.3.0> sudo apt-mark hold websense-web-security

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

dnf --showduplicates list websense-web-security sudo dnf downgrade websense-web-security-<VERSION_BEFORE_6.3.0> sudo dnf versionlock add websense-web-security

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.

websense websense web filter UPGRADE

Affected: <= 6.3.3 · 6.3.0 · 6.3.1

Fixed in: newer than 6.3.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy websense-web-filter || rpm -q websense-web-filter || websense-web-filter --version

2. UPGRADE to newer than 6.3.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade websense-web-filter

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade websense-web-filter

Note

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

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-2010-5144?

websense: upgrade to newer than 6.3.3; websense web security: downgrade or apply the listed mitigation; websense web filter: upgrade to newer than 6.3.3. Exact commands for each OS are on this page.

Is CVE-2010-5144 being exploited?

CVE-2010-5144 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-2010-5144 affect?

CVE-2010-5144 affects websense, websense web security, websense web filter. Severity is medium (CVSS 4.3). The ISAPI Filter plug-in in Websense Enterprise, Websense Web Security, and Websense Web Filter 6.3.3 and earlier, when used in conjunction with a Microsoft ISA or Microsoft Forefront TMG server, allows remote attackers to bypass intended f

How urgent is CVE-2010-5144?

Priority 39/100. Public exploit reference

References

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