CVE-2016-5430: The RSA 1.5 algorithm implementation in the JOSE_JWE class in JWE.php in jose-php before 2.2.1 lacks the Rando

Q: How do I fix CVE-2016-5430?

jose-php: upgrade to 2.2.1. Exact commands for each OS are on this page.

Q: Is CVE-2016-5430 being exploited?

CVE-2016-5430 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-2016-5430 affect?

CVE-2016-5430 affects jose-php. Severity is medium (CVSS 5.3). The RSA 1.5 algorithm implementation in the JOSE_JWE class in JWE.php in jose-php before 2.2.1 lacks the Random Filling protection mechanism, which makes it easier for remote attackers to obtain cleartext data via a Million Message Attack (

Q: How urgent is CVE-2016-5430?

Priority 43/100. Remotely exploitable, no login, no user action

This month

MEDIUM 5.3REMOTEUPGRADE

CVE-2016-5430 is a medium-severity flaw (CVSS 5.3) affecting jose-php. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The RSA 1.5 algorithm implementation in the JOSE_JWE class in JWE.php in jose-php before 2.2.1 lacks the Random Filling protection mechanism, which makes it easier for remote attackers to obtain cleartext data via a Million Message Attack (MMA).

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	1.7% (top 22%)
CISA exploited list	No
Weakness	CWE-200, CWE-310
Published	2016-09-03
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: jose-php project

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

Am I affected?

Timeline

2016-09-03 20:59 UTCPublished CVE record published
2026-06-17 00:49 UTCUpdated Record last modified

jose-php project jose-php UPGRADE

Affected: < 2.2.1

Fixed in: 2.2.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy jose-php || rpm -q jose-php || jose-php --version

2. UPGRADE to 2.2.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jose-php

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jose-php

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-2016-5430?

jose-php: upgrade to 2.2.1. Exact commands for each OS are on this page.

Is CVE-2016-5430 being exploited?

CVE-2016-5430 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-2016-5430 affect?

CVE-2016-5430 affects jose-php. Severity is medium (CVSS 5.3). The RSA 1.5 algorithm implementation in the JOSE_JWE class in JWE.php in jose-php before 2.2.1 lacks the Random Filling protection mechanism, which makes it easier for remote attackers to obtain cleartext data via a Million Message Attack (

How urgent is CVE-2016-5430?

Priority 43/100. Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2016-5429 LOW 3.7 UPGRADE jose-php before 2.2.1 does not use constant-time operations for HMAC comparison, which makes it easier for rem

References

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