CVE-2023-29726: The Call Blocker application 6.6.3 for Android incorrectly opens a key component that an attacker can use to i

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HIGH 7.5REMOTEDOWNGRADE

CVE-2023-29726 is a high-severity flaw (CVSS 7.5) 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 incorrectly opens a key component that an attacker can use to inject large amounts of dirty data into the application's database. When the application starts, it loads the data from the database into memory. Once the attacker injects too much data, the application triggers an OOM error and crashes, resulting in a persistent denial of service.

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	1.2% (top 32%)
CISA exploited list	No
Weakness	CWE-404
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-2023-29726?

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

Is CVE-2023-29726 being exploited?

CVE-2023-29726 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-2023-29726 affect?

CVE-2023-29726 affects call blocker. Severity is high (CVSS 7.5). The Call Blocker application 6.6.3 for Android incorrectly opens a key component that an attacker can use to inject large amounts of dirty data into the application's database. When the application starts, it loads the data from the databas

How urgent is CVE-2023-29726?

Priority 53/100. High 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-2023-29727 CRITICAL 9.8 DOWNGRADE The Call Blocker application 6.6.3 for Android allows unauthorized applications to use exposed components to d

References

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