Traffic disruption via unscrubbed cross-namespace packet metadata
Published May 20, 2025 · Updated Sep 8, 2026
Improper input validation in Linux bpf_redirect_peer allows remote attackers to expose cross-namespace packet state and disrupt traffic. The skb_do_redirect path preserves conntrack, NAT, destination, and XFRM metadata when redirecting an skb into another network namespace instead of scrubbing it. Exploitation requires a BPF peer redirect across namespaces, such as a Cilium datapath, where stale host state can disclose internal metadata or make destination policy checks drop traffic.
Summary
What happened
Improper input validation in Linux bpf_redirect_peer allows remote attackers to expose cross-namespace packet state and disrupt traffic. The skb_do_redirect path preserves conntrack, NAT, destination, and XFRM metadata when redirecting an skb into another network namespace instead of scrubbing it. Exploitation requires a BPF peer redirect across namespaces, such as a Cilium datapath, where stale host state can disclose internal metadata or make destination policy checks drop traffic.
The record
- CVE
- CVE-2025-37959
- Published
- May 20, 2025
- Updated
- Sep 8, 2026
- Vendor
- Siemens
- Product
- SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
- Classifications
- CWE-20, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 20, 2025CVE publishedPublication date reported by the CVE source.
- Sep 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=V3.1.6 <*
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- eBPF CVE Analysis proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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