CVE-2009-1040: Buffer overflow in WinAsm Studio 5.1.5.0 allows user-assisted remote attackers to execute arbitrary code via a

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HIGH 9.3DOWNGRADE

CVE-2009-1040 is a high-severity flaw (CVSS 9.3) affecting winasm studio. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in WinAsm Studio 5.1.5.0 allows user-assisted remote attackers to execute arbitrary code via a crafted project (.wap) file.

Why this priority

Critical severity
EPSS top 7%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.3 (High)
EPSS exploit chance	5.8% (top 7%)
CISA exploited list	No
Weakness	CWE-119
Published	2009-03-20
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: winasm

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2009-03-20 18:30 UTCPublished CVE record published
2026-06-16 23:06 UTCUpdated Record last modified

winasm winasm studio DOWNGRADE

Affected: 5.1.5.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.1.5.0

1. Check installed version

apt-cache policy winasm-studio || rpm -q winasm-studio || winasm-studio --version

2. No fixed release: DOWNGRADE to a release before 5.1.5.0 (Debian / Ubuntu)

apt-cache madison winasm-studio sudo apt install winasm-studio=<VERSION_BEFORE_5.1.5.0> sudo apt-mark hold winasm-studio

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

dnf --showduplicates list winasm-studio sudo dnf downgrade winasm-studio-<VERSION_BEFORE_5.1.5.0> sudo dnf versionlock add winasm-studio

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: WinAsm Studio 5.1.5.0 - Local Heap Overflow (PoC)

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-2009-1040?

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

Is CVE-2009-1040 being exploited?

CVE-2009-1040 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-2009-1040 affect?

CVE-2009-1040 affects winasm studio. Severity is high (CVSS 9.3). Buffer overflow in WinAsm Studio 5.1.5.0 allows user-assisted remote attackers to execute arbitrary code via a crafted project (.wap) file.

How urgent is CVE-2009-1040?

Priority 61/100. Critical severity; EPSS top 7%: very likely to be exploited; Public exploit reference

References

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