CVE-2023-29727: The Call Blocker application 6.6.3 for Android allows unauthorized applications to use exposed components to d

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2023-29727 is a critical-severity flaw (CVSS 9.8) affecting call blocker. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Call Blocker application 6.6.3 for Android allows unauthorized applications to use exposed components to delete data stored in its database that is related to user privacy settings and affects the implementation of the normal functionality of the application. An attacker can use this to cause an escalation of privilege attack.

Why this priority

Critical 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	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Weakness	CWE-922
Published	2023-05-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: applika

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

Am I affected?

Timeline

2023-05-30 23:15 UTCPublished CVE record published
2026-06-17 05:50 UTCUpdated Record last modified

applika call blocker DOWNGRADE

Affected: 6.6.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.6.3

1. Check installed version

apt-cache policy call-blocker || rpm -q call-blocker || call-blocker --version

2. No fixed release: DOWNGRADE to a release before 6.6.3 (Debian / Ubuntu)

apt-cache madison call-blocker sudo apt install call-blocker=<VERSION_BEFORE_6.6.3> sudo apt-mark hold call-blocker

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

dnf --showduplicates list call-blocker sudo dnf downgrade call-blocker-<VERSION_BEFORE_6.6.3> sudo dnf versionlock add call-blocker

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-2023-29727?

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

Is CVE-2023-29727 being exploited?

CVE-2023-29727 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-2023-29727 affect?

CVE-2023-29727 affects call blocker. Severity is critical (CVSS 9.8). The Call Blocker application 6.6.3 for Android allows unauthorized applications to use exposed components to delete data stored in its database that is related to user privacy settings and affects the implementation of the normal functional

How urgent is CVE-2023-29727?

Priority 61/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Android vulnerabilities

Related CVEs

CVE-2023-29728 CRITICAL 9.8 DOWNGRADE The Call Blocker application 6.6.3 for Android allows attackers to tamper with feature-related data, resulting
CVE-2023-29726 HIGH 7.5 DOWNGRADE The Call Blocker application 6.6.3 for Android incorrectly opens a key component that an attacker can use to i

References

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