CVE-2008-5006: smtp.c in the c-client library in University of Washington IMAP Toolkit 2007b allows remote SMTP servers to ca

Routine

MEDIUM 5.0DOWNGRADE

CVE-2008-5006 is a medium-severity flaw (CVSS 5.0) affecting imap toolkit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

smtp.c in the c-client library in University of Washington IMAP Toolkit 2007b allows remote SMTP servers to cause a denial of service (NULL pointer dereference and application crash) by responding to the QUIT command with a close of the TCP connection instead of the expected 221 response code.

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	1.9% (top 20%)
CISA exploited list	No
Weakness	CWE-399
Published	2008-11-10
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: university of washington

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

Am I affected?

Timeline

2008-11-10 14:12 UTCPublished CVE record published
2026-06-16 22:58 UTCUpdated Record last modified

university of washington imap toolkit DOWNGRADE

Affected: 2007b

Fixed in: no fixed release known

Safe to downgrade to: a release before 2007b

1. Check installed version

apt-cache policy imap-toolkit || rpm -q imap-toolkit || imap-toolkit --version

2. No fixed release: DOWNGRADE to a release before 2007b (Debian / Ubuntu)

apt-cache madison imap-toolkit sudo apt install imap-toolkit=<VERSION_BEFORE_2007b> sudo apt-mark hold imap-toolkit

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

dnf --showduplicates list imap-toolkit sudo dnf downgrade imap-toolkit-<VERSION_BEFORE_2007b> sudo dnf versionlock add imap-toolkit

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-2008-5006?

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

Is CVE-2008-5006 being exploited?

CVE-2008-5006 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-2008-5006 affect?

CVE-2008-5006 affects imap toolkit. Severity is medium (CVSS 5.0). smtp.c in the c-client library in University of Washington IMAP Toolkit 2007b allows remote SMTP servers to cause a denial of service (NULL pointer dereference and application crash) by responding to the QUIT command with a close of the TCP

How urgent is CVE-2008-5006?

Priority 37/100. No elevated risk signals yet.

Related CVEs

CVE-2008-5005 HIGH 10.0 DOWNGRADE DOWNGRADE Multiple stack-based buffer overflows in (1) University of Washington IMAP Toolkit 2002 through 2007c, (2) Uni

References

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