CVE-2003-1110: The Session Initiation Protocol (SIP) implementation in Columbia SIP User Agent (sipc) 1.74 and other versions

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HIGH 7.5DOWNGRADE

CVE-2003-1110 is a high-severity flaw (CVSS 7.5) affecting sipc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Session Initiation Protocol (SIP) implementation in Columbia SIP User Agent (sipc) 1.74 and other versions before sipc 2.0 build 2003-02-21 allows remote attackers to cause a denial of service or execute arbitrary code via crafted INVITE messages, as demonstrated by the OUSPG PROTOS c07-sip test suite.

Why this priority

High severity
EPSS top 7%: 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	5.3% (top 7%)
CISA exploited list	No
Published	2003-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: columbia university

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

columbia university sipc DOWNGRADE

Affected: 1.74

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.74

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.74 (Debian / Ubuntu)

apt-cache madison sipc sudo apt install sipc=<VERSION_BEFORE_1.74> sudo apt-mark hold sipc

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

dnf --showduplicates list sipc sudo dnf downgrade sipc-<VERSION_BEFORE_1.74> sudo dnf versionlock add sipc

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-2003-1110?

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

Is CVE-2003-1110 being exploited?

CVE-2003-1110 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-2003-1110 affect?

CVE-2003-1110 affects sipc. Severity is high (CVSS 7.5). The Session Initiation Protocol (SIP) implementation in Columbia SIP User Agent (sipc) 1.74 and other versions before sipc 2.0 build 2003-02-21 allows remote attackers to cause a denial of service or execute arbitrary code via crafted INVIT

How urgent is CVE-2003-1110?

Priority 54/100. High severity; EPSS top 7%: very likely to be exploited; Public exploit reference

References

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