Security readout for executives and security teams
Plain-English summary
CVE-2020-13529 is a denial-of-service risk in systemd 245’s DHCP client handling. A nearby network attacker could spoof DHCP traffic that causes a vulnerable server to be reconfigured, affecting availability. The public data rates this medium, with high attack complexity and adjacent-network access required.
Executive priority
Treat as a moderate availability risk for systems using vulnerable DHCP client behavior on adjacent networks. Prioritize internet-adjacent infrastructure less than local-network-exposed servers where DHCP control or spoofing would disrupt operations.
Technical view
The issue is CWE-290 in systemd 245. A crafted DHCP FORCERENEW packet combined with a spoofed DHCP ACK can trigger unauthorized DHCP reconfiguration. CVSS 3.0 is 6.1, AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H, indicating availability impact without confidentiality or integrity impact in the scoring.
Likely exposure
Most likely exposure is Linux systems using vulnerable systemd 245 DHCP client behavior, specifically noted for Canonical Ubuntu 20.04 LTS. Vendor advisories also exist for Gentoo, Fedora, and NetApp, so affected inventory should be checked against each vendor’s advisory rather than assumed broadly.
Exploitation context
The bundle does not show CISA KEV listing or active exploitation. The attack requires adjacent-network positioning and high complexity. Public reporting describes crafted DHCP FORCERENEW and spoofed ACK traffic, but this assessment does not provide exploitation steps.
Researcher notes
Evidence supports denial of service through DHCP spoofing against systemd 245. Public metadata names Ubuntu 20.04 LTS and links multiple vendor advisories, but the bundle does not include full affected-version ranges or universal fixed versions. Avoid broad product claims beyond cited advisories.
Mitigation direction
- Identify systems running systemd 245, especially Ubuntu 20.04 LTS DHCP clients.
- Apply vendor-provided systemd or platform updates from relevant advisories.
- Review Gentoo, Fedora, NetApp, and OS vendor guidance for affected package status.
- Limit DHCP client exposure to trusted network segments where operationally possible.
- Monitor for unexpected DHCP-driven network reconfiguration on servers.
Validation and detection
- Inventory systemd versions and DHCP client usage across Linux servers.
- Map affected assets to Ubuntu, Gentoo, Fedora, NetApp, or other vendor advisories.
- Confirm vendor patches are installed through approved package management records.
- Review network logs for unexpected DHCP FORCERENEW or reconfiguration events.
- Document systems where vendor applicability remains unclear.
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-290: 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-2020-13529 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
- 6.1 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
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:3.0/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H1.64Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.1MediumVector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://talosintelligence.com/vulnerability_reports/TALOS-2020-1142CVE reference · x_refsource_MISC
- GLSA-202107-48CVE reference · vendor-advisory, x_refsource_GENTOO
- FEDORA-2021-166e461c8dCVE reference · vendor-advisory, x_refsource_FEDORA
- https://security.netapp.com/advisory/ntap-20210625-0005/CVE reference · x_refsource_CONFIRM
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.
Authentication Bypass by Spoofing
Authentication Bypass by Spoofing represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.