Security readout for executives and security teams
Plain-English summary
Dnsmasq could accept a forged DNS reply more easily because it forwarded duplicate pending queries for the same name. A successful attack could poison DNS answers and redirect users or systems to attacker-controlled destinations. The source material does not show confirmed active exploitation.
Executive priority
Prioritize remediation on DNS infrastructure, edge appliances, routers, and embedded devices because poisoned DNS can redirect business traffic silently. Treat internet-adjacent or broadly reachable DNS forwarders as higher urgency.
Technical view
Before dnsmasq 2.83, duplicate pending queries for the same name were not checked before forwarding. Up to 150 similar pending upstream queries could exist, enabling an off-path network attacker to reduce DNS reply-forgery effort. Chaining with CVE-2020-25684 further reduces attack complexity.
Likely exposure
Exposure is likely where dnsmasq before 2.83 is used as a DNS forwarder or cache, including Linux distributions and embedded or network products that bundle dnsmasq. Confirm product-specific status through vendor advisories.
Exploitation context
The described attacker is off-path but on the network. The impact is DNS cache poisoning or forged DNS responses, primarily affecting data integrity. CISA KEV status is false in the supplied bundle, so active exploitation is not established here.
Researcher notes
This is a DNS transaction entropy weakness aligned with RFC5452 birthday-attack concerns. The bundle provides no exploit code, no CVSS vector, and no proof of active exploitation. Analysis should focus on dnsmasq versioning, vendor backports, and whether CVE-2020-25684 is also present.
Mitigation direction
- Upgrade dnsmasq to 2.83 or a vendor-fixed package.
- Apply relevant Debian, Fedora, Gentoo, or product vendor advisories.
- Identify appliances or embedded systems that bundle dnsmasq.
- Restrict DNS forwarding service exposure to trusted networks where feasible.
- Review vendor guidance for any product-specific compensating controls.
Validation and detection
- Inventory systems and products running dnsmasq.
- Confirm installed dnsmasq versions are not before 2.83.
- Check vendor advisories for distribution-specific fixed package versions.
- Verify DNS forwarders are not exposed beyond intended networks.
- Track CVE-2020-25684 because chaining reduces attack complexity.
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-358: 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-2020-25686 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://www.jsof-tech.com/disclosures/dnspooq/CVE reference · x_refsource_MISC
- https://bugzilla.redhat.com/show_bug.cgi?id=1890125CVE reference · x_refsource_MISC
- FEDORA-2021-84440e87baCVE reference · vendor-advisory, x_refsource_FEDORA
- GLSA-202101-17CVE reference · vendor-advisory, x_refsource_GENTOO
- DSA-4844CVE reference · vendor-advisory, x_refsource_DEBIAN
- FEDORA-2021-2e4c3d5a9dCVE reference · vendor-advisory, x_refsource_FEDORA
- https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61CVE reference · x_refsource_MISC
- https://www.kb.cert.org/vuls/id/434904CVE reference
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.