CVE-2018-20343: Multiple buffer overflow vulnerabilities have been found in Ken Silverman Build Engine 1

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HIGH 7.8DOWNGRADE

CVE-2018-20343 is a high-severity flaw (CVSS 7.8) affecting build engine. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple buffer overflow vulnerabilities have been found in Ken Silverman Build Engine 1. An attacker could craft a special map file to execute arbitrary code when the map file is loaded.

Why this priority

High severity

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.2% (top 17%)
CISA exploited list	No
Weakness	CWE-120
Published	2020-03-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: advsys

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

Am I affected?

Timeline

2020-03-02 21:15 UTCPublished CVE record published
2026-06-17 01:52 UTCUpdated Record last modified

advsys build engine DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy build-engine || rpm -q build-engine || build-engine --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison build-engine sudo apt install build-engine=<VERSION_BEFORE_1.0> sudo apt-mark hold build-engine

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

dnf --showduplicates list build-engine sudo dnf downgrade build-engine-<VERSION_BEFORE_1.0> sudo dnf versionlock add build-engine

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-2018-20343?

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

Is CVE-2018-20343 being exploited?

CVE-2018-20343 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-2018-20343 affect?

CVE-2018-20343 affects build engine. Severity is high (CVSS 7.8). Multiple buffer overflow vulnerabilities have been found in Ken Silverman Build Engine 1. An attacker could craft a special map file to execute arbitrary code when the map file is loaded.

How urgent is CVE-2018-20343?

Priority 48/100. High severity

References

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