CVE-2023-27653: An issue found in WHOv.1.0.28, v.1.0.30, v.1.0.32 allows an attacker to cause a denial of service via the Shar

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HIGH 7.5REMOTEDOWNGRADE

CVE-2023-27653 is a high-severity flaw (CVSS 7.5) affecting who. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue found in WHOv.1.0.28, v.1.0.30, v.1.0.32 allows an attacker to cause a denial of service via the SharedPreference files.

Why this priority

High severity
Public exploit reference
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	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-770
Published	2023-04-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: whoapp

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

Am I affected?

Timeline

2023-04-14 12:15 UTCPublished CVE record published
2026-06-17 05:45 UTCUpdated Record last modified

whoapp who DOWNGRADE

Affected: 1.0.28 · 1.0.30 · 1.0.32

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.28

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.28 (Debian / Ubuntu)

apt-cache madison who sudo apt install who=<VERSION_BEFORE_1.0.28> sudo apt-mark hold who

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

dnf --showduplicates list who sudo dnf downgrade who-<VERSION_BEFORE_1.0.28> sudo dnf versionlock add who

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-2023-27653?

who: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-27653 being exploited?

CVE-2023-27653 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-2023-27653 affect?

CVE-2023-27653 affects who. Severity is high (CVSS 7.5). An issue found in WHOv.1.0.28, v.1.0.30, v.1.0.32 allows an attacker to cause a denial of service via the SharedPreference files.

How urgent is CVE-2023-27653?

Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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