CVE-2018-19519

MEDIUMEPSS 83th pctl

5.5

CVSS v3

Description

In tcpdump 4.9.2, a stack-based buffer over-read exists in the print_prefix function of print-hncp.c via crafted packet data because of missing initialization.

CWE-125Out-of-bounds Read CWE-909

How to fix

Remediation Available

tcpdumpAmazon

Fixed in:14:4.9.2-4.amzn2.1

tcpdump-debuginfoAmazon

Fixed in:14:4.9.2-4.amzn2.1

tcpdumpUbuntu

Fixed in:4.9.3-0ubuntu0.14.04.1+esm1USN-4252-2

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:4.9.3-0ubuntu0.16.04.1USN-4252-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:4.9.3-0ubuntu0.18.04.1USN-4252-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Exploit Intelligence

2.36%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Exploit1

github.com

Third-Party Advisory1

securityfocus.com

Other references7

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV + Ransom	Fix
CVE-2020-8794	Critical	9.8	89%	-	Fix
CVE-2023-21769	High	7.5	89%	-	Fix
CVE-2023-49285	High	8.6	88%	-	Fix

Common questions

How do I fix CVE-2018-19519?

Published advisories record a fix for 3 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2018-19519 being actively exploited?

Not that we know of. CVE-2018-19519 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 2.4% is the estimated probability that it will be exploited in the next 30 days. That is higher than 83% of all scored CVEs.

How severe is CVE-2018-19519?

CVE-2018-19519 has a CVSS v3 base score of 5.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2018-19519 affect?

Published advisories record a fix for tcpdump (Amazon), tcpdump-debuginfo (Amazon), tcpdump (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-17.