CVE-2020-13101: In OASIS Digital Signature Services (DSS) 1.0, an attacker can control the validation outcome (i.e., trigger e

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HIGH 7.5REMOTEDOWNGRADE

CVE-2020-13101 is a high-severity flaw (CVSS 7.5) affecting oasis digital signature services. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In OASIS Digital Signature Services (DSS) 1.0, an attacker can control the validation outcome (i.e., trigger either a valid or invalid outcome for a valid or invalid signature) via a crafted XML signature, when the InlineXML option is used. This defeats the expectation of non-repudiation.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-347
Published	2020-08-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: oasis-open

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

Am I affected?

Timeline

2020-08-24 08:15 UTCPublished CVE record published
2026-06-17 02:52 UTCUpdated Record last modified

oasis-open oasis digital signature services DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy oasis-digital-signature-services || rpm -q oasis-digital-signature-services || oasis-digital-signature-services --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison oasis-digital-signature-services sudo apt install oasis-digital-signature-services=<VERSION_BEFORE_1.0> sudo apt-mark hold oasis-digital-signature-services

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list oasis-digital-signature-services sudo dnf downgrade oasis-digital-signature-services-<VERSION_BEFORE_1.0> sudo dnf versionlock add oasis-digital-signature-services

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2020-13101?

oasis digital signature services: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-13101 being exploited?

CVE-2020-13101 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-2020-13101 affect?

CVE-2020-13101 affects oasis digital signature services. Severity is high (CVSS 7.5). In OASIS Digital Signature Services (DSS) 1.0, an attacker can control the validation outcome (i.e., trigger either a valid or invalid outcome for a valid or invalid signature) via a crafted XML signature, when the InlineXML option is used.

How urgent is CVE-2020-13101?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

References

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