Security readout for executives and security teams
Plain-English summary
CVE-2020-18976 is a denial-of-service flaw in Tcpreplay 4.3.2. A specially crafted packet-capture file can trigger a buffer overflow when processed by tcpreplay-edit, potentially crashing the tool. Business risk is mainly disruption to systems or workflows that analyze untrusted pcap files.
Executive priority
Treat as a targeted operational risk, not an internet-wide emergency. Prioritize teams that handle customer, incident-response, or externally supplied pcap files, and confirm whether vendor-fixed builds are available.
Technical view
The source description identifies a buffer overflow in the do_checksum function in checksum.c, reachable through tcpreplay-edit when handling a crafted pcap file. The issue is distinct from CVE-2019-8381. No CVSS score, CWE, confirmed fixed version, or affected CPE list is provided.
Likely exposure
Exposure is likely limited to hosts using Tcpreplay 4.3.2, especially where tcpreplay-edit processes pcap files from external, low-trust, or automated sources.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The documented attack condition is processing a crafted pcap file with tcpreplay-edit; no remote network exploitation is established in the source bundle.
Researcher notes
Evidence is sparse: the CVE record names the vulnerable function, binary, version, and crafted pcap trigger, but lacks CVSS, CWE, detailed affected ranges, and a confirmed fix. Avoid broad claims beyond Tcpreplay 4.3.2.
Mitigation direction
- Identify and reduce use of Tcpreplay 4.3.2 where possible.
- Do not process untrusted pcap files on production or privileged systems.
- Check Tcpreplay vendor guidance and release notes for fixed versions.
- Run pcap analysis tooling with least privilege and isolation.
- Limit automated ingestion of external packet captures.
Validation and detection
- Inventory systems and containers for Tcpreplay 4.3.2.
- Confirm whether tcpreplay-edit is installed or used in workflows.
- Map sources of pcap files handled by affected systems.
- Review crash reports or service failures around pcap processing.
- Check vendor issue tracking for remediation status.
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-2020-18976 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
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/556CVE 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.