CVE-2015-3206 json
python-kerberos vulnerable to KDC spoofing attacks
published 2017-08-25 9 y ago modified 2026-06-17 4 mo ago also GHSA-mffc-9gx5-99g3 , PYSEC-2017-49 , PYSEC-2017-66 , EUVD-2017-0067
- cvss
- 8.1
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.4%
- EPSS 2.4% chance of exploitation in 30 days, percentile 84%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi pykerberos 1.1.6
- pykerberos Debian 14, Debian 13, Debian 12 1.1.5-1
debian advisories DEBIAN-CVE-2015-3206
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2015-3206 updated cvss 4.3
python-kerberos: checkPassword() does not verify KDC authenticity
-
Red Hat Enterprise Linux 5 python-kerberos Red Hat Enterprise Linux 6 python-kerberos Red Hat Enterprise Linux 7 python-kerberosaffected: no fix available
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
2.39% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 8.1 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
| GitHub | 3.0 | 8.1 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | kerberos | <=1.2.5 >=0.0 |
no fix listed |
| pypi | pykerberos | <1.1.6 |
1.1.6 |
Classification
- Weakness
-
- CWE-287 Improper Authentication
References
-
openwall.com
/lists/oss-security/2015/05/21/3
mailing-list, web, patch, third-party-advisory
-
bugzilla.redhat.com
/show_bug.cgi?id=1223802
web, issue-tracking, patch, third-party-advisory, report
-
pypi.python.org
/pypi/kerberos
web, patch, vendor-advisory
-
github.com
/apple/ccs-pykerberos/issues/31
web, issue-tracking, patch, third-party-advisory, report
-
github.com
/apple/ccs-pykerberos/commit/9cb61c93f9b24dd18a0a315f3df5445529c5c333
web
-
securityfocus.com
/bid/74760
vdb-entry, third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2015-3206
advisory
-
github.com
/apple/ccs-pykerberos
package
-
github.com
/pypa/advisory-database/tree/main/vulns/kerberos/PYSEC-2017-49.yaml
web
-
github.com
/pypa/advisory-database/tree/main/vulns/pykerberos/PYSEC-2017-66.yaml
web
-
web.archive.org
/web/20150910143429/https://trac.calendarserver.org/ticket/833
web
-
web.archive.org
/web/20200228090829/http://www.securityfocus.com/bid/74760
web
-
github.com
/advisories/GHSA-mffc-9gx5-99g3
advisory
Sources
- CVE List CVE-2015-3206
- GitHub Advisory GHSA-mffc-9gx5-99g3
- NVD CVE-2015-3206
- OSV PYSEC-2017-66
- OSV PYSEC-2017-49
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.