CVE-2006-0634: Borland C++Builder 6 (BCB6) with Update Pack 4 Enterprise edition (ent_upd4) evaluates the "i>sizeof(int)" exp

Routine

MEDIUM 4.6DOWNGRADE

CVE-2006-0634 is a medium-severity flaw (CVSS 4.6) affecting c\+\+ builder. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Borland C++Builder 6 (BCB6) with Update Pack 4 Enterprise edition (ent_upd4) evaluates the "i>sizeof(int)" expression to false when i equals -1, which might introduce integer overflow vulnerabilities into applications that could be exploited by context-dependent attackers.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.6 (Medium)
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Published	2006-02-10
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: borland software

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

Am I affected?

Timeline

2006-02-10 11:02 UTCPublished CVE record published
2026-06-16 22:20 UTCUpdated Record last modified

borland software c\+\+ builder DOWNGRADE

Affected: 6 enterprise_update_4

Fixed in: no fixed release known

Safe to downgrade to: a release before 6

1. Check installed version

apt-cache policy c++-builder || rpm -q c++-builder || c++-builder --version

2. No fixed release: DOWNGRADE to a release before 6 (Debian / Ubuntu)

apt-cache madison c++-builder sudo apt install c++-builder=<VERSION_BEFORE_6> sudo apt-mark hold c++-builder

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

dnf --showduplicates list c++-builder sudo dnf downgrade c++-builder-<VERSION_BEFORE_6> sudo dnf versionlock add c++-builder

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-2006-0634?

c\+\+ builder: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-0634 being exploited?

CVE-2006-0634 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-2006-0634 affect?

CVE-2006-0634 affects c\+\+ builder. Severity is medium (CVSS 4.6). Borland C++Builder 6 (BCB6) with Update Pack 4 Enterprise edition (ent_upd4) evaluates the "i>sizeof(int)" expression to false when i equals -1, which might introduce integer overflow vulnerabilities into applications that could be exploite

How urgent is CVE-2006-0634?

Priority 25/100. No elevated risk signals yet.

Related CVEs

CVE-2006-6201 HIGH 7.5 DOWNGRADE DOWNGRADE Heap-based buffer overflow in Borland idsql32.dll 5.1.0.4, as used by RevilloC MailServer; 5.2.0.2 as used by

References

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