CVE-2001-0519: Aladdin eSafe Gateway versions 2.x allows a remote attacker to circumvent HTML SCRIPT filtering via a special

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HIGH 7.5DOWNGRADE

CVE-2001-0519 is a high-severity flaw (CVSS 7.5) affecting esafe gateway. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Aladdin eSafe Gateway versions 2.x allows a remote attacker to circumvent HTML SCRIPT filtering via a special arrangement of HTML tags which includes SCRIPT tags embedded within other SCRIPT tags.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	2.5% (top 16%)
CISA exploited list	No
Published	2001-08-14
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: aladdin knowledge systems

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

Am I affected?

Timeline

2001-08-14 04:00 UTCPublished CVE record published
2026-06-16 21:54 UTCUpdated Record last modified

aladdin knowledge systems esafe gateway DOWNGRADE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

apt-cache policy esafe-gateway || rpm -q esafe-gateway || esafe-gateway --version

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison esafe-gateway sudo apt install esafe-gateway=<VERSION_BEFORE_2.0> sudo apt-mark hold esafe-gateway

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

dnf --showduplicates list esafe-gateway sudo dnf downgrade esafe-gateway-<VERSION_BEFORE_2.0> sudo dnf versionlock add esafe-gateway

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: Aladdin Knowledge Systems eSafe Gateway 3.0 - HTML tag Script-filtering Bypass

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-2001-0519?

esafe gateway: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2001-0519 being exploited?

CVE-2001-0519 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-2001-0519 affect?

CVE-2001-0519 affects esafe gateway. Severity is high (CVSS 7.5). Aladdin eSafe Gateway versions 2.x allows a remote attacker to circumvent HTML SCRIPT filtering via a special arrangement of HTML tags which includes SCRIPT tags embedded within other SCRIPT tags.

How urgent is CVE-2001-0519?

Priority 52/100. High severity; Public exploit reference

Related CVEs

CVE-2003-1449 HIGH 7.5 DOWNGRADE Aladdin Knowlege Systems eSafe Gateway 3.5.126.0 does not check the entire stream of Content Vectoring Protoco
CVE-2001-0521 HIGH 7.5 DOWNGRADE Aladdin eSafe Gateway versions 3.0 and earlier allows a remote attacker to circumvent HTML SCRIPT filtering vi
CVE-2001-0520 HIGH 7.5 DOWNGRADE Aladdin eSafe Gateway versions 3.0 and earlier allows a remote attacker to circumvent filtering of SCRIPT tags

References

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