CVE-2019-13455

CRITICALNVD 9.89.8—

9.8

In Xymon through 4.3.28, a stack-based buffer overflow vulnerability exists in the alert acknowledgment CGI tool because of expansion in acknowledge.c.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 77.9%
KEV: Not listed

Published

August 27, 2019

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated May 29, 2026

Patch available.

generic

[Xymon] Xymon 4.3.29 Released - Important Security Update

https://lists.xymon.com/archive/2019-July/046570.html

generic Patch Available

[SECURITY] [DLA 1898-1] xymon security update

https://lists.debian.org/debian-lts-announce/2019/08/msg00032.html

generic

xymon/branches/4.3.28/web/acknowledge.c at master · svn2github/xymon · GitHub

https://github.com/svn2github/xymon/blob/master/branches/4.3.28/web/acknowledge.c

Weakness Classification(1)

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

CWE-787Out-of-bounds Write

Data Freshness Timeline

(refreshed 13× 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.

2026-06-05 22:45 UTCepss_batch
2026-06-05 22:45 UTCepss_batch
2026-06-05 06:08 UTCepss_batch
2026-06-05 06:08 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 15:11 UTCEG score recompute
2026-05-27 15:11 UTCGHSA enrichment
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch

Frequently asked(5)

What is CVE-2019-13455?

CVE-2019-13455 is a critical vulnerability published on August 27, 2019. In Xymon through 4.3.28, a stack-based buffer overflow vulnerability exists in the alert acknowledgment CGI tool because of   expansion in acknowledge.c.

When was CVE-2019-13455 disclosed?

CVE-2019-13455 was first published in the National Vulnerability Database on August 27, 2019, 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-2019-13455 actively exploited?

CVE-2019-13455 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 77.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2019-13455?

CVE-2019-13455 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2019-13455?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-13455, 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.

Dependency Blast Radius

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CVE-2019-13455

📅 Published

🔄 Last Modified

📋 Advisory Details (3)