Is CVE-2017-11424 in the CISA KEV catalog?

No. CVE-2017-11424 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-11424?

CVE-2017-11424 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2017-11424?

CVE-2017-11424 has an EPSS score of 1.80% (76th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-11424?

Upgrade pyjwt on debian 11 to 1.4.2-1.1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2017-11424

HIGHEPSS 76th pctl

7.5

CVSS v3

NVD

Description

In PyJWT 1.5.0 and below the `invalid_strings` check in `HMACAlgorithm.prepare_key` does not account for all PEM encoded public keys. Specifically, the PKCS1 PEM encoded format would be allowed because it is prefaced with the string `-----BEGIN RSA PUBLIC KEY-----` which is not accounted for. This enables symmetric/asymmetric key confusion attacks against users using the PKCS1 PEM encoded public keys, which would allow an attacker to craft JWTs from scratch.

How to fix

Remediation Available

pyjwtDebian

Fixed in:1.4.2-1.1CVE-2017-11424

pyjwtUbuntu

Fixed in:1.3.0-1ubuntu0.1USN-3407-1

python-jwtUbuntu

Fixed in:1.3.0-1ubuntu0.1USN-3407-1

python3-jwtUbuntu

Fixed in:1.3.0-1ubuntu0.1USN-3407-1

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

Exploit Intelligence

1.80%probability of exploitation in 30 days

76thpercentile

Elevated risk: more likely to be exploited than 76% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory1

debian.org

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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 2026-05-13.