CVE-2002-2121: SurfControl SuperScout Email filter for SMTP 3.5.1 allows remote attackers to cause a denial of service (crash

Routine

MEDIUM 5.0DOWNGRADE

CVE-2002-2121 is a medium-severity flaw (CVSS 5.0) affecting superscout email filter. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SurfControl SuperScout Email filter for SMTP 3.5.1 allows remote attackers to cause a denial of service (crash) via a long SMTP (1) HELO or (2) RCPT TO command, possibly due to a buffer overflow.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.6% (top 15%)
CISA exploited list	No
Published	2002-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: surfcontrol

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

Am I affected?

Timeline

2002-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:00 UTCUpdated Record last modified

surfcontrol superscout email filter DOWNGRADE

Affected: 3.5.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.5.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.5.1 (Debian / Ubuntu)

apt-cache madison superscout-email-filter sudo apt install superscout-email-filter=<VERSION_BEFORE_3.5.1> sudo apt-mark hold superscout-email-filter

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

dnf --showduplicates list superscout-email-filter sudo dnf downgrade superscout-email-filter-<VERSION_BEFORE_3.5.1> sudo dnf versionlock add superscout-email-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.

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-2002-2121?

superscout email filter: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2002-2121 being exploited?

CVE-2002-2121 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-2002-2121 affect?

CVE-2002-2121 affects superscout email filter. Severity is medium (CVSS 5.0). SurfControl SuperScout Email filter for SMTP 3.5.1 allows remote attackers to cause a denial of service (crash) via a long SMTP (1) HELO or (2) RCPT TO command, possibly due to a buffer overflow.

How urgent is CVE-2002-2121?

Priority 39/100. No elevated risk signals yet.

Related CVEs

CVE-2002-1532 MEDIUM 5.0 DOWNGRADE The administrative web interface (STEMWADM) for SurfControl SuperScout Email Filter allows remote attackers to
CVE-2002-1531 MEDIUM 5.0 DOWNGRADE The administrative web interface (STEMWADM) for SurfControl SuperScout Email Filter allows remote attackers to
CVE-2002-1530 MEDIUM 5.0 DOWNGRADE The administrative web interface (STEMWADM) for SurfControl SuperScout Email Filter allows users to obtain use
CVE-2002-1529 MEDIUM 4.3 DOWNGRADE Cross-site scripting (XSS) vulnerability in msgError.asp for the administrative web interface (STEMWADM) for S

References

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