Security readout for executives and security teams
Plain-English summary
CVE-2018-20553 affects Tcpreplay versions before 4.3.1. A crafted or malformed input could make the tool read past a heap buffer while determining layer-2 length. The public sources do not provide a CVSS score, confirmed impact, or evidence of active exploitation.
Executive priority
Treat this as a targeted remediation item, not an emergency, unless vulnerable Tcpreplay is used in automated workflows handling external packet data. Prioritize upgrade during normal vulnerability maintenance, with faster action for exposed analysis pipelines.
Technical view
The issue is a heap-based buffer over-read in get_l2len in common/get.c in Tcpreplay before 4.3.1. The source bundle cites a GitHub issue and a fixing commit, but does not include exploit maturity, affected platforms, or a detailed impact statement.
Likely exposure
Exposure is limited to environments running Tcpreplay before 4.3.1, especially where the tool processes packet data from untrusted or external sources. The bundle does not identify downstream distributions, packaged versions, or hosted services as affected.
Exploitation context
No CISA KEV listing is present, and the provided sources do not state active exploitation. Public issue and patch references exist, which may help defenders understand the bug, but the bundle does not support claims about real-world attacks.
Researcher notes
Evidence is sparse: the CVE states the vulnerable function and fixed version, and references a GitHub issue and commit. No CVSS, CWE, exploit status, or detailed impact is supplied in the bundle, so severity should remain provisional.
Mitigation direction
- Upgrade Tcpreplay to version 4.3.1 or later.
- Check Tcpreplay project guidance for any additional vendor-recommended fixes.
- Avoid processing untrusted packet data with vulnerable versions.
- Run vulnerable tooling in isolated, low-privilege environments until upgraded.
Validation and detection
- Inventory systems and build images for Tcpreplay installations.
- Confirm installed Tcpreplay versions are 4.3.1 or later.
- Review security tooling pipelines for untrusted packet inputs.
- Check package manager metadata for backported fixes if version strings differ.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2018-20553 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/appneta/tcpreplay/issues/530CVE reference · x_refsource_MISC
- https://github.com/appneta/tcpreplay/pull/532/commits/6b830a1640ca20528032c89a4fdd8291a4d2d8b2CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.