An exploitable denial-of-service vulnerability exists in Systemd 245. A specially crafted DHCP FORCERENEW packet can cause a server running the DHCP client to be vulnerable to a DHCP ACK spoofing attack. An attacker can forge a pair of FORCERENEW and DCHP ACK packets to reconfigure the server.
CVSS v4.0 Metrics
Exploitability
Attack VectorAdjacent
ComplexityHigh
RequirementsPresent
PrivilegesNone
User InteractionNone
Threat
Exploit MaturityPoC
Vulnerable System
ConfidentialityNone
IntegrityNone
AvailabilityHigh
Subsequent System
ConfidentialityNone
IntegrityNone
AvailabilityNone
Supplemental
SafetyNegligible
AutomatableYes
RecoveryAutomatic
Value DensityConcentrated
UrgencyMedium
Change Log
| Date | Source | Changes | Score |
|---|
| 2026-07-21 | PoC | E: U→P | 2.3 → 5.4 |
| 2026-07-21 | cve.org | initial, patch: Unavailable | 2.3 |
Affected Software
| Vendor | Product | Version |
|---|
| fedoraproject | fedora | 33 |
| n/a | Systemd | Canonical Ubuntu 20.04 LTS, Systemd 245 |
| netapp | active_iq_unified_manager | All versions |
| netapp | cloud_backup | All versions |
| systemd_project | systemd | 245 |
Published: 2021-05-10
