CVE-2008-4515: Blue Coat K9 Web Protection 4.0.230 Beta relies on client-side JavaScript as a protection mechanism, which all

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HIGH 7.5DOWNGRADE

CVE-2008-4515 is a high-severity flaw (CVSS 7.5) affecting k9 web protection. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Blue Coat K9 Web Protection 4.0.230 Beta relies on client-side JavaScript as a protection mechanism, which allows remote attackers to bypass authentication and access the (1) summary, (2) detail, (3) overrides, and (4) pwemail pages by disabling JavaScript.

Why this priority

High severity

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	1.6% (top 25%)
CISA exploited list	No
Weakness	CWE-287
Published	2008-10-09
Last modified	2026-06-16

Publisher (CNA): MITRE · 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

2008-10-09 18:00 UTCPublished CVE record published
2026-06-16 22:57 UTCUpdated Record last modified

blue coat systems k9 web protection DOWNGRADE

Affected: 4.0.230 beta

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.230

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 4.0.230 (Debian / Ubuntu)

apt-cache madison k9-web-protection sudo apt install k9-web-protection=<VERSION_BEFORE_4.0.230> 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_4.0.230> 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-2008-4515?

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

Is CVE-2008-4515 being exploited?

CVE-2008-4515 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-2008-4515 affect?

CVE-2008-4515 affects k9 web protection. Severity is high (CVSS 7.5). Blue Coat K9 Web Protection 4.0.230 Beta relies on client-side JavaScript as a protection mechanism, which allows remote attackers to bypass authentication and access the (1) summary, (2) detail, (3) overrides, and (4) pwemail pages by disa

How urgent is CVE-2008-4515?

Priority 45/100. High severity

Related CVEs

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
CVE-2007-1685 HIGH 10.0 DOWNGRADE Buffer overflow in k9filter.exe in BlueCoat K9 Web Protection 3.2.36, and probably other versions before 3.2.4

References

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