CVE-2007-2952: Multiple stack-based buffer overflows in the filter service (aka k9filter.exe) in Blue Coat K9 Web Protection

This week

HIGH 9.3DOWNGRADEDOWNGRADE

CVE-2007-2952 is a high-severity flaw (CVSS 9.3) affecting filter, k9 web protection. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple stack-based buffer overflows in the filter service (aka k9filter.exe) in Blue Coat K9 Web Protection 3.2.44 with Filter 3.2.32 allow (1) remote attackers to execute arbitrary code via a long HTTP Referer header to the K9 Web Protection Administration interface and (2) man-in-the-middle attackers to execute arbitrary code via an HTTP response with a long HTTP version field.

Why this priority

Critical severity
EPSS top 3%: very likely to be exploited

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

Risk facts

CVSS score	9.3 (High)
EPSS exploit chance	15.5% (top 3%)
CISA exploited list	No
Weakness	CWE-119
Published	2008-08-01
Last modified	2026-06-16

Publisher (CNA): Flexera Software LLC · Vendor: blue coat systems

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

Am I affected?

Timeline

2008-08-01 14:41 UTCPublished CVE record published
2026-06-16 22:40 UTCUpdated Record last modified

blue coat systems filter DOWNGRADE

Affected: 3.2.32

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.2.32

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.2.32 (Debian / Ubuntu)

apt-cache madison filter sudo apt install filter=<VERSION_BEFORE_3.2.32> sudo apt-mark hold filter

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

dnf --showduplicates list filter sudo dnf downgrade filter-<VERSION_BEFORE_3.2.32> sudo dnf versionlock add filter

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.

blue coat systems k9 web protection DOWNGRADE

Affected: 3.2.44

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.2.44

1. Check installed version

apt-cache policy k9-web-protection || rpm -q k9-web-protection || k9-web-protection --version

2. No fixed release: DOWNGRADE to a release before 3.2.44 (Debian / Ubuntu)

apt-cache madison k9-web-protection sudo apt install k9-web-protection=<VERSION_BEFORE_3.2.44> sudo apt-mark hold k9-web-protection

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

dnf --showduplicates list k9-web-protection sudo dnf downgrade k9-web-protection-<VERSION_BEFORE_3.2.44> sudo dnf versionlock add k9-web-protection

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-2007-2952?

filter: downgrade or apply the listed mitigation; k9 web protection: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2007-2952 being exploited?

CVE-2007-2952 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-2007-2952 affect?

CVE-2007-2952 affects filter, k9 web protection. Severity is high (CVSS 9.3). Multiple stack-based buffer overflows in the filter service (aka k9filter.exe) in Blue Coat K9 Web Protection 3.2.44 with Filter 3.2.32 allow (1) remote attackers to execute arbitrary code via a long HTTP Referer header to the K9 Web Protec

How urgent is CVE-2007-2952?

Priority 57/100. Critical severity; EPSS top 3%: very likely to be exploited

Related CVEs

CVE-2004-1272 HIGH 10.0 DOWNGRADE Buffer overflow in the save_embedded_address function in filter.c for elm/bolthole filter 2.6.1 allows remote

References

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