CVE-1999-1289: ICQ 98 beta on Windows NT leaks the internal IP address of a client in the TCP data segment of an ICQ packet i

This month

HIGH 7.5DOWNGRADE

CVE-1999-1289 is a high-severity flaw (CVSS 7.5) affecting icq. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ICQ 98 beta on Windows NT leaks the internal IP address of a client in the TCP data segment of an ICQ packet instead of the public address (e.g. through NAT), which provides remote attackers with potentially sensitive information about the client or the internal network configuration.

Why this priority

High severity

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Published	1998-11-11
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: mirabilis

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

Am I affected?

Timeline

1998-11-11 05:00 UTCPublished CVE record published
2026-06-16 21:50 UTCUpdated Record last modified

mirabilis icq DOWNGRADE

Affected: 98_beta

Fixed in: no fixed release known

Safe to downgrade to: a release before 98_beta

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 98_beta (Debian / Ubuntu)

apt-cache madison icq sudo apt install icq=<VERSION_BEFORE_98_beta> sudo apt-mark hold icq

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

dnf --showduplicates list icq sudo dnf downgrade icq-<VERSION_BEFORE_98_beta> sudo dnf versionlock add icq

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-1999-1289?

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

Is CVE-1999-1289 being exploited?

CVE-1999-1289 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-1999-1289 affect?

CVE-1999-1289 affects icq. Severity is high (CVSS 7.5). ICQ 98 beta on Windows NT leaks the internal IP address of a client in the TCP data segment of an ICQ packet instead of the public address (e.g. through NAT), which provides remote attackers with potentially sensitive information about the

How urgent is CVE-1999-1289?

Priority 44/100. High severity

Software pages

Windows vulnerabilities

Related CVEs

CVE-2011-0487 HIGH 9.3 DOWNGRADE ICQ 7 does not verify the authenticity of updates, which allows man-in-the-middle attackers to execute arbitra
CVE-2009-1915 MEDIUM 4.3 DOWNGRADE Stack-based buffer overflow in the URL Search Hook (ICQToolBar.dll) in ICQ 6.5 allows remote attackers to caus
CVE-2007-1904 MEDIUM 4.3 UPGRADE UPGRADE Directory traversal vulnerability in AOL Instant Messenger (AIM) 5.9 and earlier, and ICQ 5.1 and probably ear
CVE-2006-5724 LOW 2.1 DOWNGRADE Heap-based buffer overflow the "Answering Service" function in ICQ 2003b Build 3916 allows local users to caus
CVE-2006-5650 HIGH 7.5 DOWNGRADE The ICQPhone.SipxPhoneManager ActiveX control in America Online ICQ 5.1 allows remote attackers to download an

References

← Back to latest CVEs