Is CVE-2020-5390 in the CISA KEV catalog?

No. CVE-2020-5390 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-5390?

CVE-2020-5390 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2020-5390?

CVE-2020-5390 has an EPSS score of 1.21% (65th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-5390?

Upgrade python-pysaml2 on debian 11 to 4.5.0-7 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2020-5390

HIGH

7.5

CVSS v3

NVD

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.

CWE-347

How to fix

Remediation Available

python-pysaml2Debian

Fixed in:4.5.0-7CVE-2020-5390

python-pysaml2Ubuntu

Fixed in:3.0.0-3ubuntu1.16.04.4USN-4245-1

Fixed in:4.0.2-0ubuntu3.1USN-4245-1

python3-pysaml2Ubuntu

Fixed in:3.0.0-3ubuntu1.16.04.4USN-4245-1

Fixed in:4.0.2-0ubuntu3.1USN-4245-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

1.21%probability of exploitation in 30 days

65thpercentile

Moderate risk: more likely to be exploited than 65% of all known CVEs.

References

Patch2

Third-Party Advisory6

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.