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CVE-2005-0021

Multiple buffer overflows in Exim before 4.43 may allow attackers to execute arbitrary code via ...

7.2 HighPublic exploitFix available

Multiple buffer overflows in Exim before 4.43 may allow attackers to execute arbitrary code via (1) an IPv6 address with more than 8 components, as demonstrated using the -be command line option, which triggers an overflow in the host_aton function, or (2) the -bh command line option or dnsdb PTR lookup, which triggers an overflow in the dns_build_reverse function.

Exploit likelihood

2.62%Down 4.2 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 7.2

Multiple buffer overflows in Exim before 4.43 may allow attackers to execute arbitrary code via (1) an IPv6 address with more than 8 components, as demonstrated using the -be command line option, which triggers an overflow in the host_aton function, or (2) the -bh command line option or dnsdb PTR lookup, which triggers an overflow in the dns_build_reverse function.

Record
CVE-2005-0021
CVSS 2.0
7.2 HighAV:L/AC:L/Au:N/C:C/I:C/A:C
Updated
2026-11-02
CVE List No score

Multiple buffer overflows in Exim before 4.43 may allow attackers to execute arbitrary code via (1) an IPv6 address with more than 8 components, as demonstrated using the -be command line option, which triggers an overflow in the host_aton function, or (2) the -bh command line option or dnsdb PTR lookup, which triggers an overflow in the dns_build_reverse function.

Record
CVE-2005-0021
Updated
2026-11-02
EUVDEUVD-2005-0022 No score

Multiple buffer overflows in Exim before 4.43 may allow attackers to execute arbitrary code via (1) an IPv6 address with more than 8 components, as demonstrated using the -be command line option, which triggers an overflow in the host_aton function, or (2) the -bh command line option or dnsdb PTR lookup, which triggers an overflow in the dns_build_reverse function.

Record
EUVD-2005-0022
Updated
2026-11-03
GitHub AdvisoriesGHSA-4wq7-f94f-64w2 No score

Multiple buffer overflows in Exim before 4.43 may allow attackers to execute arbitrary code via ...

Multiple buffer overflows in Exim before 4.43 may allow attackers to execute arbitrary code via (1) an IPv6 address with more than 8 components, as demonstrated using the -be command line option, which triggers an overflow in the host_aton function, or (2) the -bh command line option or dnsdb PTR lookup, which triggers an overflow in the dns_build_reverse function.

Record
GHSA-4wq7-f94f-64w2
Updated
2026-11-02
OSV No score

Multiple buffer overflows in Exim before 4.43 may allow attackers to execute arbitrary code via (1) an IPv6 address with more than 8 components, as demonstrated using the -be command line option, which triggers an overflow in the host_aton function, or (2) the -bh command line option or dnsdb PTR lookup, which triggers an overflow in the dns_build_reverse function.

Record
CVE-2005-0021
Updated
2026-11-02
OSVDEBIAN-CVE-2005-0021 No score

Multiple buffer overflows in Exim before 4.43 may allow attackers to execute arbitrary code via (1) an IPv6 address with more than 8 components, as demonstrated using the -be command line option, which triggers an overflow in the host_aton function, or (2) the -bh command line option or dnsdb PTR lookup, which triggers an overflow in the dns_build_reverse function.

Record
DEBIAN-CVE-2005-0021
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
exim4
Debian:12
 before 4.34-10
4.34-10
exim4
Debian:13
 before 4.34-10
4.34-10
exim4
Debian:14
 before 4.34-10
4.34-10
exim
Debian:3.0
 before 3.35-1woody4, plus listed versions
3.35-1woody3
3.35-1woody4
exim-tls
Debian:3.0
 before 3.35-3woody3, plus listed versions
3.35-3woody1
3.35-3woody3
exim
Red Hat:enterprise_linux:4::as
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3
exim-debuginfo
Red Hat:enterprise_linux:4::as
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3
exim-doc
Red Hat:enterprise_linux:4::as
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3
exim-mon
Red Hat:enterprise_linux:4::as
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3
exim-sa
Red Hat:enterprise_linux:4::as
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3
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Affected packages
PackageAffectedFixed
exim
Red Hat:enterprise_linux:4::desktop
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3
exim-debuginfo
Red Hat:enterprise_linux:4::desktop
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3
exim-doc
Red Hat:enterprise_linux:4::desktop
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3
exim-mon
Red Hat:enterprise_linux:4::desktop
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3
exim-sa
Red Hat:enterprise_linux:4::desktop
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3
exim
Red Hat:enterprise_linux:4::es
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3
exim-debuginfo
Red Hat:enterprise_linux:4::es
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3
exim-doc
Red Hat:enterprise_linux:4::es
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3
exim-mon
Red Hat:enterprise_linux:4::es
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3
exim-sa
Red Hat:enterprise_linux:4::es
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3
exim
Red Hat:enterprise_linux:4::ws
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3
exim-debuginfo
Red Hat:enterprise_linux:4::ws
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3
exim-doc
Red Hat:enterprise_linux:4::ws
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3
exim-mon
Red Hat:enterprise_linux:4::ws
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3
exim-sa
Red Hat:enterprise_linux:4::ws
 before 0:4.43-1.RHEL4.3
0:4.43-1.RHEL4.3

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
Exploit-DBExim 4.41 - 'dns_build_reverse' Local Read Emails2005-05-25
Exploit-DBExim 4.41 - 'dns_build_reverse' Local Buffer Overflow2005-01-15

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, Exploit-DB, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2005-0021 is a high vulnerability (CVSS 7.2) in University Of Cambridge Exim, published January 6, 2005. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 2.62%, the 85th percentile. Fixed in exim4 4.34-10.

References

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