CVE-2002-1721: Off-by-one error in alterMIME 0.1.10 and 0.1.11 allows remote attackers to cause a denial of service (crash) v

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HIGH 7.5REMOTEDOWNGRADE

CVE-2002-1721 is a high-severity flaw (CVSS 7.5) affecting altermime. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Off-by-one error in alterMIME 0.1.10 and 0.1.11 allows remote attackers to cause a denial of service (crash) via an x-header that causes snprintf overwrite the FFGET_FILE variable with a (null) byte.

Why this priority

High severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.3% (top 17%)
CISA exploited list	No
Weakness	CWE-193
Published	2002-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: pldaniels

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 21:59 UTCUpdated Record last modified

pldaniels altermime DOWNGRADE

Affected: 0.1.10 · 0.1.11

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.1.10

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.1.10 (Debian / Ubuntu)

apt-cache madison altermime sudo apt install altermime=<VERSION_BEFORE_0.1.10> sudo apt-mark hold altermime

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

dnf --showduplicates list altermime sudo dnf downgrade altermime-<VERSION_BEFORE_0.1.10> sudo dnf versionlock add altermime

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-2002-1721?

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

Is CVE-2002-1721 being exploited?

CVE-2002-1721 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-2002-1721 affect?

CVE-2002-1721 affects altermime. Severity is high (CVSS 7.5). Off-by-one error in alterMIME 0.1.10 and 0.1.11 allows remote attackers to cause a denial of service (crash) via an x-header that causes snprintf overwrite the FFGET_FILE variable with a (null) byte.

How urgent is CVE-2002-1721?

Priority 52/100. High severity; Remotely exploitable, no login, no user action

References

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