CVE-2009-2632: Buffer overflow in the SIEVE script component (sieve/script.c), as used in cyrus-imapd in Cyrus IMAP Server 2.

Routine

MEDIUM 4.4DOWNGRADE

CVE-2009-2632 is a medium-severity flaw (CVSS 4.4) affecting cyrus imap server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in the SIEVE script component (sieve/script.c), as used in cyrus-imapd in Cyrus IMAP Server 2.2.13 and 2.3.14, and Dovecot 1.0 before 1.0.4 and 1.1 before 1.1.7, allows local users to execute arbitrary code and read or modify arbitrary messages via a crafted SIEVE script, related to the incorrect use of the sizeof operator for determining buffer length, combined with an integer signedness error.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.4 (Medium)
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-119
Published	2009-09-08
Last modified	2026-06-16

Publisher (CNA): CERT/CC · Vendor: cmu

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

Am I affected?

Timeline

2009-09-08 23:30 UTCPublished CVE record published
2026-06-16 23:09 UTCUpdated Record last modified

cmu cyrus imap server DOWNGRADE

Affected: 2.2.13 · 2.3.14

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.2.13

1. Check installed version

apt-cache policy cyrus-imap-server || rpm -q cyrus-imap-server || cyrus-imap-server --version

2. No fixed release: DOWNGRADE to a release before 2.2.13 (Debian / Ubuntu)

apt-cache madison cyrus-imap-server sudo apt install cyrus-imap-server=<VERSION_BEFORE_2.2.13> sudo apt-mark hold cyrus-imap-server

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

dnf --showduplicates list cyrus-imap-server sudo dnf downgrade cyrus-imap-server-<VERSION_BEFORE_2.2.13> sudo dnf versionlock add cyrus-imap-server

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-2009-2632?

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

Is CVE-2009-2632 being exploited?

CVE-2009-2632 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-2009-2632 affect?

CVE-2009-2632 affects cyrus imap server. Severity is medium (CVSS 4.4). Buffer overflow in the SIEVE script component (sieve/script.c), as used in cyrus-imapd in Cyrus IMAP Server 2.2.13 and 2.3.14, and Dovecot 1.0 before 1.0.4 and 1.1 before 1.1.7, allows local users to execute arbitrary code and read or modif

How urgent is CVE-2009-2632?

Priority 26/100. No elevated risk signals yet.

Software pages

Dovecot vulnerabilities

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References

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