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CVE-2015-3206

python-kerberos vulnerable to KDC spoofing attacks

8.1 HighFix available

The checkPassword function in python-kerberos does not authenticate the KDC it attempts to communicate with, which allows remote attackers to cause a denial of service (bad response), or have other unspecified impact by performing a man-in-the-middle attack.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

2.39%Up 1.2 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 8.1

The checkPassword function in python-kerberos does not authenticate the KDC it attempts to communicate with, which allows remote attackers to cause a denial of service (bad response), or have other unspecified impact by performing a man-in-the-middle attack.

Record
CVE-2015-3206
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness
CWE-287
Updated
2026-11-02
CVE List No score

The checkPassword function in python-kerberos does not authenticate the KDC it attempts to communicate with, which allows remote attackers to cause a denial of service (bad response), or have other unspecified impact by performing a man-in-the-middle attack.

Record
CVE-2015-3206
Updated
2026-11-02
EUVDEUVD-2017-0067 No score

The checkPassword function in python-kerberos does not authenticate the KDC it attempts to communicate with, which allows remote attackers to cause a denial of service (bad response), or have other unspecified impact by performing a man-in-the-middle attack.

Record
EUVD-2017-0067
Updated
2026-11-03
GitHub AdvisoriesGHSA-mffc-9gx5-99g3 9.2

python-kerberos vulnerable to KDC spoofing attacks

The checkPassword function in python-kerberos does not authenticate the KDC it attempts to communicate with, which allows remote attackers to cause a denial of service (bad response), or have other unspecified impact by performing a man-in-the-middle attack.

Record
GHSA-mffc-9gx5-99g3
CVSS 4.0
9.2 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-287
Updated
2026-11-02
OSV 8.1

The checkPassword function in python-kerberos does not authenticate the KDC it attempts to communicate with, which allows remote attackers to cause a denial of service (bad response), or have other unspecified impact by performing a man-in-the-middle attack.

Record
CVE-2015-3206
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2015-3206 8.1

The checkPassword function in python-kerberos does not authenticate the KDC it attempts to communicate with, which allows remote attackers to cause a denial of service (bad response), or have other unspecified impact by performing a man-in-the-middle attack.

Record
DEBIAN-CVE-2015-3206
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
Show 4 moreShow less
OSVGHSA-mffc-9gx5-99g3 9.2

python-kerberos vulnerable to KDC spoofing attacks

The checkPassword function in python-kerberos does not authenticate the KDC it attempts to communicate with, which allows remote attackers to cause a denial of service (bad response), or have other unspecified impact by performing a man-in-the-middle attack.

Record
GHSA-mffc-9gx5-99g3
CVSS 4.0
9.2 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-287
Updated
2026-11-02
OSVUBUNTU-CVE-2015-3206 8.1

The checkPassword function in python-kerberos does not authenticate the KDC it attempts to communicate with, which allows remote attackers to cause a denial of service (bad response), or have other unspecified impact by performing a man-in-the-middle attack.

Record
UBUNTU-CVE-2015-3206
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVPYSEC-2017-49 No score

The checkPassword function in python-kerberos does not authenticate the KDC it attempts to communicate with, which allows remote attackers to cause a denial of service (bad response), or have other unspecified impact by performing a man-in-the-middle attack.

Record
PYSEC-2017-49
Updated
2026-11-02
OSVPYSEC-2017-66 No score

The checkPassword function in python-kerberos does not authenticate the KDC it attempts to communicate with, which allows remote attackers to cause a denial of service (bad response), or have other unspecified impact by performing a man-in-the-middle attack.

Record
PYSEC-2017-66
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
kerberos
PyPI
 through 1.2.5 None known
pykerberos
PyPI
 before 1.1.6
1.1.6
pykerberos
Debian:12
 before 1.1.5-1
1.1.5-1
pykerberos
Debian:13
 before 1.1.5-1
1.1.5-1
pykerberos
Debian:14
 before 1.1.5-1
1.1.5-1
pykerberos
Debian:6.0
 before 1.1+svn4895-1+deb6u1, plus listed versions
1.1+svn4895-1
1.1+svn4895-1+deb6u1
pykerberos
Debian:6.0
 before 1.1+svn4895-1+deb6u2, plus listed versions
1.1+svn4895-1
1.1+svn4895-1+deb6u2
kerberos
PyPI
 through 1.2.5, plus listed versions
1.1.11.1.21.2.01.2.21.2.31.2.4
 None known
pykerberos
PyPI
 before 1.1.6, plus listed versions
1.1.31.1.41.1.5
1.1.6
kerberos
PyPI
 0.0 and later, plus listed versions
1.1.11.1.21.2.01.2.21.2.3
Show 4 moreShow less
1.2.41.2.51.3.01.3.1
 None known

History

History
RecordedChangedSources
affected
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2015-3206 is a high vulnerability (CVSS 8.1) in Apple Pykerberos, published July 3, 2015. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.39%, the 84th percentile. Fixed in pykerberos 1.1.6.

References

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