Security readout for executives and security teams
Plain-English summary
CVE-2020-37127 is a denial-of-service flaw in the dnsmasq-utils dhcp_release utility version 2.79-1. Excessively long input can crash the utility. The known impact is disruption of that process, not data theft or system takeover. Exposure is mainly where this utility is installed and reachable by users or automation that can invoke it.
Executive priority
Treat as a targeted availability risk, not an enterprise-wide emergency based on current sources. Prioritize internet infrastructure, DHCP operations, appliances, and images where dnsmasq-utils 2.79-1 is present or where untrusted local execution is possible.
Technical view
The issue is described as a stack-based buffer overflow, CWE-121, in dhcp_release from dnsmasq-utils 2.79-1. A crafted input string longer than 16 characters can trigger a core dump and terminate the dhcp_release process. CVSS v4.0 is 6.9 with local attack vector and high vulnerable-system availability impact.
Likely exposure
Most relevant to Linux systems or images containing dnsmasq-utils 2.79-1, especially where dhcp_release is used by local users, scripts, network-management tooling, or administrative workflows. The provided sources do not indicate remote network exploitation of dnsmasq itself.
Exploitation context
An ExploitDB entry is cited, indicating public exploit information exists. The source bundle does not show CISA KEV listing or confirmed active exploitation. The CVSS vector indicates local attack vector, no privileges, and no user interaction.
Researcher notes
Evidence is limited to the CVE record, VulnCheck advisory, ExploitDB reference, and Ubuntu source package page. No patch version, maintainer advisory, or KEV confirmation is provided in the bundle. Avoid assuming broader dnsmasq daemon impact beyond the dhcp_release utility.
Mitigation direction
- Identify systems with dnsmasq-utils 2.79-1 installed.
- Review vendor or distribution guidance for fixed packages or backports.
- Limit access to dhcp_release to trusted users and automation.
- Remove dnsmasq-utils where the utility is not required.
- Monitor for unexpected dhcp_release crashes or core dumps.
Validation and detection
- Check installed dnsmasq-utils package versions against 2.79-1.
- Confirm whether dhcp_release exists on managed hosts or images.
- Review package manager advisories for your distribution.
- Check logs for recent dhcp_release crashes or core dumps.
- Verify compensating access controls around local utility execution.
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.
CWE-121: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2020-37127 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
- Medium
- CVSS
- 6.9 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
6.9MediumVector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-48301CVE reference · exploit
- Software Link for dnsmasq 2.79-1CVE reference · product
- VulnCheck Advisory: dnsmasq-utils 2.79-1 - 'dhcp_release' Denial of ServiceCVE reference · third-party-advisory
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.
Stack-based Buffer Overflow
Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.