7.5

CVE-2020-5390: canonical ubuntu_linux

Modified
AliasesGHSA-qf7v-8hj3-4xw7PYSEC-2020-94UBUNTU-CVE-2020-5390
Published 13-01-2020Last modified 04-08-2024

Vulnerability summary

CVE-2020-5390 is a high (CVSS 7.5) vulnerability in canonical ubuntu_linux. EPSS estimates a 1.23% chance of exploitation in the next 30 days, higher than 69% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
1.23%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 5 · Related 5
OPENSUSE-SU-2024:14156-1OPENSUSE-SU-2026:11524-1SUSE-RU-2020:2072-1SUSE-SU-2020:1901-1SUSE-SU-2020:3897-1

Timeline

  1. 13-01-2020
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

PySAML2 before 5.0.0 does not check that the signature in a SAML document is enveloped and thus signature wrapping is effective, i.e., it is affected by XML Signature Wrapping (XSW). The signature information and the node/object that is signed can be in different places and thus the signature verification will succeed, but the wrong data will be used. This specifically affects the verification of assertion that have been signed.

CVSS metrics

6 scores · 4 sources · 3 versions

EPSS trend

Probability

1.23%

Chance of exploitation in the next 30 days

Percentile

69%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 1.22% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Debian2 products
  • python-pysaml2< 3.0.0-5+deb9u1 | < 4.5.0-4+deb10u1 | < 2.0.0-1+deb8u3 | < 4.5.0-7
  • debian_linuxEOL8.0 | 9.0 | 10.0
Canonical1 product
PyPI1 product
  • pysaml2< 5e9d5acbcd8ae45c4e736ac521fd2df5b1c62e25 | < 5.0.0
Pysaml2_project1 product
Ubuntu1 product
  • python-pysaml2< 3.0.0-3ubuntu1.16.04.4 | < 4.0.2-0ubuntu3.1

5 vendors · 6 products

References

19 links
Show all 19 references