CVE-2006-4662: Heap-based buffer overflow in the MCRegEx__Search function in AOL ICQ Pro 2003b Build 3916 and earlier allows

This month

HIGH 7.5DOWNGRADE

CVE-2006-4662 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.

Heap-based buffer overflow in the MCRegEx__Search function in AOL ICQ Pro 2003b Build 3916 and earlier allows remote attackers to execute arbitrary code via an inconsistent length field of a Message in a 0x2711 Type-Length-Value (TLV) type.

Why this priority

High severity
EPSS top 6%: very likely to be exploited

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	6.3% (top 6%)
CISA exploited list	No
Published	2006-09-09
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

2006-09-09 00:04 UTCPublished CVE record published
2026-06-16 22:29 UTCUpdated Record last modified

mirabilis icq DOWNGRADE

Affected: 0.99b_1.1.1.1 · 0.99b_v.3.19 · 98.0a · 99a_2.15build1701 · 99a_2.21build1800 · 2000.0a · 2000.0b_build3278 · 2001a

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.99b_1.1.1.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.99b_1.1.1.1 (Debian / Ubuntu)

apt-cache madison icq sudo apt install icq=<VERSION_BEFORE_0.99b_1.1.1.1> sudo apt-mark hold icq

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

dnf --showduplicates list icq sudo dnf downgrade icq-<VERSION_BEFORE_0.99b_1.1.1.1> 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-2006-4662?

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

Is CVE-2006-4662 being exploited?

CVE-2006-4662 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-2006-4662 affect?

CVE-2006-4662 affects icq. Severity is high (CVSS 7.5). Heap-based buffer overflow in the MCRegEx__Search function in AOL ICQ Pro 2003b Build 3916 and earlier allows remote attackers to execute arbitrary code via an inconsistent length field of a Message in a 0x2711 Type-Length-Value (TLV) type.

How urgent is CVE-2006-4662?

Priority 50/100. High severity; EPSS top 6%: very likely to be exploited

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