CVE-2007-1685: Buffer overflow in k9filter.exe in BlueCoat K9 Web Protection 3.2.36, and probably other versions before 3.2.4

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HIGH 10.0DOWNGRADE

CVE-2007-1685 is a high-severity flaw (CVSS 10.0) affecting k9 web protection. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in k9filter.exe in BlueCoat K9 Web Protection 3.2.36, and probably other versions before 3.2.44, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a long HTTP GET request to port 2372.

Why this priority

Critical severity
EPSS top 4%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	13.5% (top 4%)
CISA exploited list	No
Published	2007-06-08
Last modified	2026-06-16

Publisher (CNA): CERT/CC · Vendor: bluecoat

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

Am I affected?

Timeline

2007-06-08 20:30 UTCPublished CVE record published
2026-06-16 22:38 UTCUpdated Record last modified

bluecoat k9 web protection DOWNGRADE

Affected: 3.2.36

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.2.36

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 3.2.36 (Debian / Ubuntu)

apt-cache madison k9-web-protection sudo apt install k9-web-protection=<VERSION_BEFORE_3.2.36> 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_3.2.36> 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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Blue Coat Systems K9 Web Protection 32.36 - Remote Buffer Overflow (PoC)

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-2007-1685?

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

Is CVE-2007-1685 being exploited?

CVE-2007-1685 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-2007-1685 affect?

CVE-2007-1685 affects k9 web protection. Severity is high (CVSS 10.0). Buffer overflow in k9filter.exe in BlueCoat K9 Web Protection 3.2.36, and probably other versions before 3.2.44, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a long HTTP GET request to

How urgent is CVE-2007-1685?

Priority 64/100. Critical severity; EPSS top 4%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2008-4515 HIGH 7.5 DOWNGRADE Blue Coat K9 Web Protection 4.0.230 Beta relies on client-side JavaScript as a protection mechanism, which all
CVE-2007-2952 HIGH 9.3 DOWNGRADE DOWNGRADE Multiple stack-based buffer overflows in the filter service (aka k9filter.exe) in Blue Coat K9 Web Protection

References

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