CVE-2025-6216: Allegra calculateTokenExpDate Password Recovery Authentication Bypass Vulnerability

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CRITICAL 9.8REMOTEUPGRADE

CVE-2025-6216 is a critical-severity flaw (CVSS 9.8) affecting allegra. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Allegra calculateTokenExpDate Password Recovery Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Allegra. Authentication is not required to exploit this vulnerability. The specific flaw exists within the password recovery mechanism. The issue results from reliance upon a predictable value when generating a password reset token. An attacker can leverage this vuln

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	47.8% (top 1%)
CISA exploited list	No
Weakness	CWE-640
Published	2025-06-21
Last modified	2026-06-17

Publisher (CNA): Zero Day Initiative · Vendor: alltena

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

Am I affected?

Timeline

2025-06-21 01:15 UTCPublished CVE record published
2026-06-17 10:01 UTCUpdated Record last modified

alltena allegra UPGRADE

Affected: >= 7.0.0 and < 7.5.2.70 · >= 8.0.0 and < 8.1.24

Fixed in: 7.5.2.70, 8.1.24

Safe to downgrade to: a release before 7.0.0

1. Check installed version

apt-cache policy allegra || rpm -q allegra || allegra --version

2. UPGRADE to 7.5.2.70 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade allegra

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade allegra

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 7.0.0 (Debian / Ubuntu)

apt-cache madison allegra sudo apt install allegra=<VERSION_BEFORE_7.0.0> sudo apt-mark hold allegra

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list allegra sudo dnf downgrade allegra-<VERSION_BEFORE_7.0.0> sudo dnf versionlock add allegra

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.

Exact fixes by distribution

Fedora ELN · fips-provider-next · FIXED · 1.5.3-3.eln159 · FEDORA-2026-3ce99ec7df · source

sudo dnf upgrade --advisory=FEDORA-2026-3ce99ec7df

Fedora 46 · rubygem-webmock · FIXED · 3.26.1-3.fc46 · FEDORA-2026-bb57b4d095 · source

sudo dnf upgrade --advisory=FEDORA-2026-bb57b4d095

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-2025-6216?

allegra: upgrade to 7.5.2.70, 8.1.24. Exact commands for each OS are on this page.

Is CVE-2025-6216 being exploited?

CVE-2025-6216 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-2025-6216 affect?

CVE-2025-6216 affects allegra. Severity is critical (CVSS 9.8). Allegra calculateTokenExpDate Password Recovery Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Allegra. Authentication is not required to exploit this vu

How urgent is CVE-2025-6216?

Priority 67/100. Critical severity; EPSS top 1%: very likely to be exploited; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

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References

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