CVE-2017-15921: In Watchdog Anti-Malware 2.74.186.150 and Online Security Pro 2.74.186.150, the zam32.sys driver contains a NU

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HIGH 7.5REMOTEDOWNGRADEDOWNGRADE

CVE-2017-15921 is a high-severity flaw (CVSS 7.5) affecting anti-malware, online security pro. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Watchdog Anti-Malware 2.74.186.150 and Online Security Pro 2.74.186.150, the zam32.sys driver contains a NULL pointer dereference vulnerability that gets triggered when sending an operation to ioctl 0x80002010. This is due to the input buffer being NULL or the input buffer size being 0 as they are not validated.

Why this priority

High severity
EPSS top 5%: very likely to be exploited
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	7.6% (top 5%)
CISA exploited list	No
Weakness	CWE-476
Published	2017-10-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: watchdogdevelopment

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

Am I affected?

Timeline

2017-10-30 15:29 UTCPublished CVE record published
2026-06-17 01:08 UTCUpdated Record last modified

watchdogdevelopment anti-malware DOWNGRADE

Affected: 2.74.186.150

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.74.186.150

1. Check installed version

apt-cache policy anti-malware || rpm -q anti-malware || anti-malware --version

2. No fixed release: DOWNGRADE to a release before 2.74.186.150 (Debian / Ubuntu)

apt-cache madison anti-malware sudo apt install anti-malware=<VERSION_BEFORE_2.74.186.150> sudo apt-mark hold anti-malware

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

dnf --showduplicates list anti-malware sudo dnf downgrade anti-malware-<VERSION_BEFORE_2.74.186.150> sudo dnf versionlock add anti-malware

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.

watchdogdevelopment online security pro DOWNGRADE

Affected: 2.74.186.150

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.74.186.150

1. Check installed version

apt-cache policy online-security-pro || rpm -q online-security-pro || online-security-pro --version

2. No fixed release: DOWNGRADE to a release before 2.74.186.150 (Debian / Ubuntu)

apt-cache madison online-security-pro sudo apt install online-security-pro=<VERSION_BEFORE_2.74.186.150> sudo apt-mark hold online-security-pro

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

dnf --showduplicates list online-security-pro sudo dnf downgrade online-security-pro-<VERSION_BEFORE_2.74.186.150> sudo dnf versionlock add online-security-pro

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Watchdog Development Anti-Malware / Online Security Pro - NULL Pointer Dereference

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-2017-15921?

anti-malware: downgrade or apply the listed mitigation; online security pro: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-15921 being exploited?

CVE-2017-15921 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-2017-15921 affect?

CVE-2017-15921 affects anti-malware, online security pro. Severity is high (CVSS 7.5). In Watchdog Anti-Malware 2.74.186.150 and Online Security Pro 2.74.186.150, the zam32.sys driver contains a NULL pointer dereference vulnerability that gets triggered when sending an operation to ioctl 0x80002010. This is due to the input b

How urgent is CVE-2017-15921?

Priority 60/100. High severity; EPSS top 5%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

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References

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