CVE-2026-37459
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk29th percentile - higher than 29% of all known CVEs
Summary
An integer underflow vulnerability exists in FRRouting (FRR) versions stable/10.0 through stable/10.6. Attackers can cause a Denial of Service (DoS) by sending a crafted BGP UPDATE message.
Risk Assessment
The risk is remote disruption of BGP-speaking routers, potentially causing routing instability and network unavailability.
Recommendation
Immediately upgrade FRRouting to a version later than stable/10.6 that includes the fix. Also monitor BGP messages for suspicious updates.
Other vulnerabilities in FRRouting
See all- CVE-2020-12831Low
In FRRouting (FRR) up to version 7.3.1, when using the split-config feature, the init script creates an empty config file with world-readable default permissions, potentially leading to information leakage via frr.in and frrcommon.sh.in tools.
- CVE-2026-37460High
Missing input validation in the rfapiRibBi2Ri() function (rfapi_rib.c) in FRRouting (FRR) from stable/10.0 to stable/10.6 allows attackers to cause a Denial of Service (DoS) by supplying a crafted BGP UPDATE message.
- CVE-2026-37457High
An off-by-one out-of-bounds write vulnerability in the bgp_flowspec_op_decode() function of FRRouting (FRR) stable/10.0 allows attackers to cause a Denial of Service (DoS) via a crafted FlowSpec component.
- CVE-2023-3748Low
A flaw was found in FRRouting when parsing certain babeld unicast hello messages that are intended to be ignored. This issue may allow an attacker to send specially crafted hello messages, leading to an infinite loop and causing a denial of service.
Original NVD description (English source)
An integer underflow in FRRouting (FRR) stable/10.0 to stable/10.6 allows attackers to cause a Denial of Service (DoS) via supplying a crafted BGP UPDATE message.