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CVE-2018-19519· NVD / CVE Program· CNA mitre

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 miss

Noroxi assessment

Priority: Monitor (action score 23/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 2.5% (FIRST EPSS); higher than 84.9% of all records.
  • Someone with local access to the system can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: tcpdump (Red Hat:enterprise_linux:7::client) 14:4.9.2-4.el7_7.1; tcpdump-debuginfo (Red Hat:enterprise_linux:7::client) 14:4.9.2-4.el7_7.1; tcpdump (Red Hat:enterprise_linux:8::appstream) 14:4.9.2-6.el8.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to tcpdump (Red Hat:enterprise_linux:7::client) 14:4.9.2-4.el7_7.1; tcpdump-debuginfo (Red Hat:enterprise_linux:7::client) 14:4.9.2-4.el7_7.1; tcpdump (Red Hat:enterprise_linux:8::appstream) 14:4.9.2-6.el8 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.5 · v3.0—No exploit Fix available
Published
Nov 25, 2018
Updated
Jun 16, 2026
EPSS
2.5% · 84th percentile

Report tools

JSON

Action score

23

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.5%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
tcpdumptcpdump

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • tcpdump tcpdump4.9.2

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12tcpdumpall versions—
Red Hat:enterprise_linux:7::clienttcpdumpbefore 14:4.9.2-4.el7_7.114:4.9.2-4.el7_7.1
Red Hat:enterprise_linux:7::clienttcpdump-debuginfobefore 14:4.9.2-4.el7_7.114:4.9.2-4.el7_7.1
Red Hat:enterprise_linux:8::appstreamtcpdumpbefore 14:4.9.2-6.el814:4.9.2-6.el8
Red Hat:enterprise_linux:8::appstreamtcpdump-debuginfobefore 14:4.9.2-6.el814:4.9.2-6.el8
Red Hat:enterprise_linux:8::appstreamtcpdump-debugsourcebefore 14:4.9.2-6.el814:4.9.2-6.el8
SUSE:Linux Enterprise Desktop 12 SP3tcpdumpbefore 4.9.2-14.8.14.9.2-14.8.1
SUSE:Linux Enterprise Module for Basesystem 15tcpdumpbefore 4.9.2-3.3.14.9.2-3.3.1

Same product

tcpdump: all records

Other highest-scoring records for the same primary product.

  • CVE-2007-3798Integer overflow in print-bgp.c in the BGP dissector in tcpdump 3.9.6 and earlier allows remote attackers to execute arbitrary code via craf
    60This week
  • CVE-2017-11543tcpdump 4.9.0 has a buffer overflow in the sliplink_print function in print-sl.c.
    41Plan
  • CVE-2017-5484The ATM parser in tcpdump before 4.9.0 has a buffer overflow in print-atm.c:sig_print().
    41Plan
  • CVE-2017-5482The Q.933 parser in tcpdump before 4.9.0 has a buffer overflow in print-fr.c:q933_print(), a different vulnerability than CVE-2016-8575.
    41Plan
  • CVE-2017-5342In tcpdump before 4.9.0, a bug in multiple protocol parsers (Geneve, GRE, NSH, OTV, VXLAN and VXLAN GPE) could cause a buffer overflow in pr
    41Plan
  • CVE-2017-5341The OTV parser in tcpdump before 4.9.0 has a buffer overflow in print-otv.c:otv_print().
    41Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
red hat:tcpdump14:4.9.2-4.el7_7.1 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:tcpdump-debuginfo14:4.9.2-4.el7_7.1 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:tcpdump-debugsource14:4.9.2-6.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
suse:tcpdump4.9.2-3.3.1 · SUSE:Linux Enterprise Module for Basesystem 15Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records