CVE-2005-1100: Format string vulnerability in the ErrorLog function in cnf.c in Greylisting daemon (GLD) 1.3 and 1.4 allows r

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HIGH 7.5DOWNGRADE

CVE-2005-1100 is a high-severity flaw (CVSS 7.5) affecting gld. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Format string vulnerability in the ErrorLog function in cnf.c in Greylisting daemon (GLD) 1.3 and 1.4 allows remote attackers to execute arbitrary code via format string specifiers in data that is passed directly to syslog.

Why this priority

High severity
EPSS top 4%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	11.0% (top 4%)
CISA exploited list	No
Published	2005-05-02
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: salim gasmi

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

Am I affected?

Timeline

2005-05-02 04:00 UTCPublished CVE record published
2026-06-16 22:12 UTCUpdated Record last modified

salim gasmi gld DOWNGRADE

Affected: 1.3 · 1.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.3 (Debian / Ubuntu)

apt-cache madison gld sudo apt install gld=<VERSION_BEFORE_1.3> sudo apt-mark hold gld

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

dnf --showduplicates list gld sudo dnf downgrade gld-<VERSION_BEFORE_1.3> sudo dnf versionlock add gld

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: gld 1.4 - Postfix Greylisting Daemon Remote Format String

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-2005-1100?

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

Is CVE-2005-1100 being exploited?

CVE-2005-1100 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-2005-1100 affect?

CVE-2005-1100 affects gld. Severity is high (CVSS 7.5). Format string vulnerability in the ErrorLog function in cnf.c in Greylisting daemon (GLD) 1.3 and 1.4 allows remote attackers to execute arbitrary code via format string specifiers in data that is passed directly to syslog.

How urgent is CVE-2005-1100?

Priority 55/100. High severity; EPSS top 4%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2005-1099 HIGH 10.0 DOWNGRADE Multiple buffer overflows in the HandleChild function in server.c in Greylisting daemon (GLD) 1.3 and 1.4, whe

References

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