Remote service crash via nonwrapping AES counter increment
Published May 9, 2025 · Updated Jun 30, 2026
Denial of service in ring before 0.17.12 allows remote attackers to crash QUIC applications with a crafted packet. HeaderProtectionKey::new_mask passes a packet-derived counter through Counter::increment_by_less_safe, whose ordinary u32 addition panics at u32::MAX when overflow checks are enabled instead of wrapping. Reachability requires overflow checking, which release builds do not enable by default; the bounded consequence is process termination without data disclosure or modification.
Summary
What happened
Denial of service in ring before 0.17.12 allows remote attackers to crash QUIC applications with a crafted packet. HeaderProtectionKey::new_mask passes a packet-derived counter through Counter::increment_by_less_safe, whose ordinary u32 addition panics at u32::MAX when overflow checks are enabled instead of wrapping. Reachability requires overflow checking, which release builds do not enable by default; the bounded consequence is process termination without data disclosure or modification.
The record
- CVE
- CVE-2025-4432
- Published
- May 9, 2025
- Updated
- Jun 30, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat Enterprise Linux 6
- Classifications
- CWE-770, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 9, 2025CVE publishedPublication date reported by the CVE source.
- Jun 30, 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?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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