CVE-2017-1000246: Python package pysaml2 version 4.4.0 and earlier reuses the initialization vector across encryptions in the ID

Q: How do I fix CVE-2017-1000246?

pysaml2: upgrade to 4.6.0. Exact commands for each OS are on this page.

Q: Is CVE-2017-1000246 being exploited?

CVE-2017-1000246 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-2017-1000246 affect?

CVE-2017-1000246 affects pysaml2. Severity is medium (CVSS 5.3). Python package pysaml2 version 4.4.0 and earlier reuses the initialization vector across encryptions in the IDP server, resulting in weak encryption of data.

Q: How urgent is CVE-2017-1000246?

Priority 38/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2017-1000246 is a medium-severity flaw (CVSS 5.3) affecting pysaml2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Python package pysaml2 version 4.4.0 and earlier reuses the initialization vector across encryptions in the IDP server, resulting in weak encryption of data.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-330
Published	2017-11-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: pysaml2 project

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

Am I affected?

Timeline

2017-11-17 04:29 UTCPublished CVE record published
2026-06-17 00:58 UTCUpdated Record last modified

pysaml2 project pysaml2 UPGRADE

Affected: < 4.6.0

Fixed in: 4.6.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 4.6.0 (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.

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-2017-1000246?

pysaml2: upgrade to 4.6.0. Exact commands for each OS are on this page.

Is CVE-2017-1000246 being exploited?

CVE-2017-1000246 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-2017-1000246 affect?

CVE-2017-1000246 affects pysaml2. Severity is medium (CVSS 5.3). Python package pysaml2 version 4.4.0 and earlier reuses the initialization vector across encryptions in the IDP server, resulting in weak encryption of data.

How urgent is CVE-2017-1000246?

Priority 38/100. Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

Related CVEs

CVE-2020-5390 HIGH 7.5 UPGRADE MITIGATE PySAML2 before 5.0.0 does not check that the signature in a SAML document is enveloped and thus signature wrap
CVE-2017-1000433 HIGH 8.1 UPGRADE MITIGATE pysaml2 version 4.4.0 and older accept any password when run with python optimizations enabled
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
CVE-2016-10127 CRITICAL 9.0 MITIGATE PySAML2 allows remote attackers to conduct XML external entity (XXE) attacks via a crafted SAML XML request or

References

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