CVE-2003-1236: Multiple format string vulnerabilities in the logger function in netzio.c for Tanne 0.6.17 allows remote attac

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HIGH 10.0DOWNGRADE

CVE-2003-1236 is a high-severity flaw (CVSS 10.0) affecting tanne. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple format string vulnerabilities in the logger function in netzio.c for Tanne 0.6.17 allows remote attackers to execute arbitrary code via format string specifiers in syslog.

Why this priority

Critical severity
EPSS top 3%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	15.2% (top 3%)
CISA exploited list	No
Published	2003-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: tanne

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

Am I affected?

Timeline

2003-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:03 UTCUpdated Record last modified

tanne tanne DOWNGRADE

Affected: 0.6.17

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.6.17

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.6.17 (Debian / Ubuntu)

apt-cache madison tanne sudo apt install tanne=<VERSION_BEFORE_0.6.17> sudo apt-mark hold tanne

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

dnf --showduplicates list tanne sudo dnf downgrade tanne-<VERSION_BEFORE_0.6.17> sudo dnf versionlock add tanne

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: TANne 0.6.17 - Session Manager SysLog 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-2003-1236?

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

Is CVE-2003-1236 being exploited?

CVE-2003-1236 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-2003-1236 affect?

CVE-2003-1236 affects tanne. Severity is high (CVSS 10.0). Multiple format string vulnerabilities in the logger function in netzio.c for Tanne 0.6.17 allows remote attackers to execute arbitrary code via format string specifiers in syslog.

How urgent is CVE-2003-1236?

Priority 64/100. Critical severity; EPSS top 3%: very likely to be exploited; Public exploit reference

References

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