CVE-2026-85234
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk37th percentile - higher than 37% of all known CVEs
Summary
A flaw was found in tftp-hpa. When the `in.tftpd` remap engine processes an inverse remap rule that also aborts with a non-empty custom error message, it can pass invalid match offsets to the `genmatchstring()` function. This leads to out-of-bounds read/write operations. A remote, unauthenticated attacker can exploit this vulnerability by sending a specially crafted request, causing the daemon to crash and resulting in a denial of service.
Risk Assessment
A remote, unauthenticated attacker can crash the TFTP service, causing denial of service for legitimate clients. In some scenarios, it may also lead to code execution.
Recommendation
Update tftp-hpa to a version containing the fix. If updating is not possible, restrict access to the TFTP service to trusted networks only.
Other vulnerabilities in tftp-hpa
Original NVD description (English source)
A flaw was found in tftp-hpa. When the `in.tftpd` remap engine processes an inverse remap rule that also aborts with a non-empty custom error message, it can pass invalid match offsets to the `genmatchstring()` function. This leads to out-of-bounds read/write operations. A remote, unauthenticated attacker can exploit this vulnerability by sending a specially crafted request, causing the daemon to crash and resulting in a denial of service.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS