Which products and versions are affected by CVE-1999-0009?

Affected: Dg Ux (Data General) versions 5.4_3.0, 5.4_3.1, 5.4_4.1, 5.4_4.11; Bind (Isc) versions 4.9.6, 8.1, 8.1.1; Bsd OS (Bsdi) versions 2.0, 2.0.1, 2.1, among others. The full list is in the CVE brief.

Is CVE-1999-0009 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-1999-0009 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-1999-0009?

Public exploit code is available.

Is there a fix for CVE-1999-0009?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-1999-0009 be patched?

Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

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WatchlistCritical

CVE-1999-0009Bind Vulnerability

Inverse query buffer overflow in BIND 4.9 and BIND 8 Releases.

Published Apr 8, 1998 · Updated Apr 15, 2026

Key Facts

Patch immediately

CVE-1999-0009 is a critical-severity vulnerability (CVSS 10.0 v2) affecting Dg Ux (Data General), Bind (Isc), Bsd OS (Bsdi) and 10 more products.
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 29% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

Scores

CVSS v2

10.0

AV:N/AC:L/Au:N/C:C/I:C/A:C

EPSS (30-day exploit likelihood)

29%

Higher than 98.1% of all scored CVEs

Exploit maturity

Proof of concept

ATLAS score

40/100

Publication score, see How it works

Exploitation Verdict

KEV listed

Not listed

Federal due date

None

No federal due date

Ransomware use

Not reported

Attributed actors

None named

Exploit & Defence Guidance

Exploit maturity

Proof of concept

Public exploit code

Proof-of-concept links

In-the-wild evidence

Reports of active use

Description

Inverse query buffer overflow in BIND 4.9 and BIND 8 Releases.

Affected Products

76 affected entries in total

Product	Affected versions	Fixed in
Dg UxData General	5.4_3.0, 5.4_3.1, 5.4_4.1, 5.4_4.11	n/a
BindIsc	4.9.6, 8.1, 8.1.1	n/a
Bsd OSBsdi	2.0, 2.0.1, 2.1	n/a
OpenlinuxCaldera	1.0	n/a
AixIbm	4.1, 4.1.1, 4.1.2, 4.1.3, 4.1.4, 4.1.5, 4.2, 4.2.1	n/a

8 more affected products in the full CVE brief

Timeline

Publicly disclosed
Apr 8, 1998
Last updated
Apr 15, 2026

References

FAQ

Common Questions.

Inverse query buffer overflow in BIND 4.9 and BIND 8 Releases.
Affected: Dg Ux (Data General) versions 5.4_3.0, 5.4_3.1, 5.4_4.1, 5.4_4.11; Bind (Isc) versions 4.9.6, 8.1, 8.1.1; Bsd OS (Bsdi) versions 2.0, 2.0.1, 2.1, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

Is CVE-1999-0009 On Your Attack Surface?

Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.