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CVE-2017-1000433

27
FAUCET Score

CVE-2017-1000433 describes a critical authentication bypass vulnerability in pysaml2 versions 4.4.0 and older, affecting Debian and other systems utilizing this library. When Python optimizations are enabled, the software incorrectly accepts any password, allowing unauthenticated attackers to log in as any user. This high-severity flaw (CVSS 8.1) presents a significant risk due to its network-based attack vector and high impact on confidentiality, integrity, and availability, despite requiring high attack complexity. Currently, there is no known active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.4.0CPE matchmatch criteria
cpe:2.3:a:pysaml2_project:pysaml2:*:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

CVSS:3.1/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
3.1

Exploit Intelligence

EPSS Score
2.52%
Probability of exploitation in next 30 days
EPSS Percentile
83.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0252 is in the 40th percentile among its peer group of 8,914 CVEs.

Social Chatter

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 (8)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: pysaml2Fixed in: 4.5.0
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux OpenStack Platform 7 (Kilo)Fixed in: python-pysaml2
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 10 (Newton)Fixed in: python-pysaml2
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 11 (Ocata)Fixed in: python-pysaml2
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 12 (Pike)Fixed in: python-pysaml2
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 8 (Liberty)Fixed in: python-pysaml2
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 9 (Mitaka)Fixed in: python-pysaml2

Vendor Advisories (2)

pipGHSA-924m-4pmx-c67hcritical

pysaml2 Improper Authentication vulnerability

Jul 13, 2018
redhatCVE-2017-1000433Low

python-pysaml2: Access restriction bypass

Sep 10, 2017

References

github.com / rohe/pysaml2/issues/451
PatchThird Party AdvisoryVDB Entry
lists.debian.org / debian-lts-announce/2018/07/msg00000.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2021/02/msg00038.html
Mailing ListThird Party Advisory
security.gentoo.org / glsa/201801-11
Issue TrackingThird Party Advisory