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CVE-2015-3206

21
FAUCET Score

CVE-2015-3206 describes a critical vulnerability in the checkPassword function of python-kerberos and Apple pykerberos, where the Kerberos Distribution Center (KDC) is not authenticated. This oversight enables remote attackers to execute man-in-the-middle attacks, potentially leading to a denial of service or other significant impacts. With a CVSS score of 8.1 (HIGH), the vulnerability is network-exploitable with high attack complexity, posing high impacts on confidentiality, integrity, and availability. Despite its severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:apple:pykerberos:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.1HIGH

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.37%
Probability of exploitation in next 30 days
EPSS Percentile
82.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0237 is in the 39th percentile among its peer group of 8,915 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: pykerberosFixed in: 1.1.6
redhatpatch availablevia nvd_reference
View patch
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: python-kerberos
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: python-kerberos
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: python-kerberos

Vendor Advisories (2)

pipGHSA-mffc-9gx5-99g3critical

python-kerberos vulnerable to KDC spoofing attacks

May 14, 2022
redhatCVE-2015-3206Moderate

python-kerberos: checkPassword() does not verify KDC authenticity

May 21, 2015

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatchThird Party Advisory
github.com / apple/ccs-pykerberos/issues/31
Issue TrackingPatchThird Party Advisory
pypi.python.org / pypi/kerberos
PatchVendor Advisory
openwall.com / lists/oss-security/2015/05/21/3
Mailing ListPatchThird Party Advisory
securityfocus.com / bid/74760
Third Party AdvisoryVDB Entry