CVE-2018-16999

MEDIUMNVD 5.55.5—

5.5

Netwide Assembler (NASM) 2.14rc15 has an invalid memory write (segmentation fault) in expand_smacro in preproc.c, which allows attackers to cause a denial of service via a crafted input file.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 54.8%
KEV: Not listed

Published

September 13, 2018

Last Modified

November 21, 2024

References (6)

cve@mitrehttp://lists.opensuse.org/opensuse-security-announce/2020-07/msg00015.html
cve@mitrehttp://lists.opensuse.org/opensuse-security-announce/2020-07/msg00017.html
cve@mitrehttps://bugzilla.nasm.us/show_bug.cgi?id=3392508
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00015.html
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00017.html
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.nasm.us/show_bug.cgi?id=3392508

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-787Out-of-bounds Write

Data Freshness Timeline

(refreshed 10× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-04 13:10 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:49 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:28 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:41 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 03:11 UTCEG score recompute
2026-05-28 03:11 UTCGHSA enrichment
2026-05-27 13:38 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 16:01 UTCOSV refresh
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2018-16999?

CVE-2018-16999 is a medium vulnerability published on September 13, 2018. Netwide Assembler (NASM) 2.14rc15 has an invalid memory write (segmentation fault) in expand_smacro in preproc.c, which allows attackers to cause a denial of service via a crafted input file.

When was CVE-2018-16999 disclosed?

CVE-2018-16999 was first published in the National Vulnerability Database on September 13, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2018-16999 actively exploited?

CVE-2018-16999 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 54.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2018-16999?

CVE-2018-16999 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2018-16999?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-16999, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2018-16999

📅 Published

🔄 Last Modified

🔗 References (6)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2018-16999?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (6)

Frequently asked(5)

Related CVEs(same CWE)