CVE-2017-1000433: pysaml2 version 4.4.0 and older accept any password when run with python optimizations enabled

Q: How do I fix CVE-2017-1000433?

pysaml2: upgrade to newer than 4.4.0; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2017-1000433 being exploited?

CVE-2017-1000433 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2017-1000433 affect?

CVE-2017-1000433 affects pysaml2, debian linux. Severity is high (CVSS 8.1). pysaml2 version 4.4.0 and older accept any password when run with python optimizations enabled. This allows attackers to log in as any user without knowing their password.

Q: How urgent is CVE-2017-1000433?

Priority 60/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This week

HIGH 8.1REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2017-1000433 is a high-severity flaw (CVSS 8.1) affecting pysaml2, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

pysaml2 version 4.4.0 and older accept any password when run with python optimizations enabled. This allows attackers to log in as any user without knowing their password.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	2.5% (top 15%)
CISA exploited list	No
Weakness	CWE-287
Published	2018-01-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · pysaml2 project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-01-02 23:29 UTCPublished CVE record published
2026-06-17 00:59 UTCUpdated Record last modified

pysaml2 project pysaml2 UPGRADE

Affected: <= 4.4.0

Fixed in: newer than 4.4.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pysaml2 || rpm -q pysaml2 || pysaml2 --version

2. UPGRADE to newer than 4.4.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pysaml2

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pysaml2

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

debian debian linux MITIGATE

Affected: 8.0 · 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2017-1000433?

pysaml2: upgrade to newer than 4.4.0; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-1000433 being exploited?

CVE-2017-1000433 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2017-1000433 affect?

CVE-2017-1000433 affects pysaml2, debian linux. Severity is high (CVSS 8.1). pysaml2 version 4.4.0 and older accept any password when run with python optimizations enabled. This allows attackers to log in as any user without knowing their password.

How urgent is CVE-2017-1000433?

Priority 60/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Python vulnerabilities · Debian vulnerabilities

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CVE-2017-1000246 MEDIUM 5.3 UPGRADE Python package pysaml2 version 4.4.0 and earlier reuses the initialization vector across encryptions in the ID
CVE-2016-10149 HIGH 7.5 UPGRADE MITIGATE XML External Entity (XXE) vulnerability in PySAML2 4.4.0 and earlier allows remote attackers to read arbitrary
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References

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