OpenBSD 7.3 invalid l2tp message npppd crash
Priority MEDIUM 40CWE-131Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-131 and the CVSS impact.
Summary
In OpenBSD 7.3 before errata 016, npppd(8) could crash by a l2tp message which has an AVP (Attribute-Value Pair) with wrong length.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00555 46th percentileScored 2026-11-07
Fix Fixed OpenBSD (OpenBSD): 7.3 errata 016
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| OpenBSD | OpenBSD | 7.3 to before 7.3 errata 016 | 7.3 errata 016 | Patch available | CNA |
- OpenBSD VendorOpenBSD Affected 7.3 to before 7.3 errata 016 Fixed in 7.3 errata 016 Patch available CNA
CPE configurations NVD · 17
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:* | before 7.3 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.3:-:*:*:*:*:*:* | 7.3 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.3:errata_001:*:*:*:*:*:* | 7.3 errata_001 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.3:errata_002:*:*:*:*:*:* | 7.3 errata_002 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.3:errata_003:*:*:*:*:*:* | 7.3 errata_003 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.3:errata_004:*:*:*:*:*:* | 7.3 errata_004 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.3:errata_005:*:*:*:*:*:* | 7.3 errata_005 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.3:errata_006:*:*:*:*:*:* | 7.3 errata_006 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.3:errata_007:*:*:*:*:*:* | 7.3 errata_007 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.3:errata_008:*:*:*:*:*:* | 7.3 errata_008 | Vulnerable | OpenBSD |
- cpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:* Versions before 7.3 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.3:-:*:*:*:*:*:* Versions 7.3 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.3:errata_001:*:*:*:*:*:* Versions 7.3 errata_001 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.3:errata_002:*:*:*:*:*:* Versions 7.3 errata_002 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.3:errata_003:*:*:*:*:*:* Versions 7.3 errata_003 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.3:errata_004:*:*:*:*:*:* Versions 7.3 errata_004 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.3:errata_005:*:*:*:*:*:* Versions 7.3 errata_005 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.3:errata_006:*:*:*:*:*:* Versions 7.3 errata_006 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.3:errata_007:*:*:*:*:*:* Versions 7.3 errata_007 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.3:errata_008:*:*:*:*:*:* Versions 7.3 errata_008 Vulnerable ·OpenBSD
Show 7 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:openbsd:openbsd:7.3:errata_009:*:*:*:*:*:* | 7.3 errata_009 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.3:errata_010:*:*:*:*:*:* | 7.3 errata_010 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.3:errata_011:*:*:*:*:*:* | 7.3 errata_011 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.3:errata_012:*:*:*:*:*:* | 7.3 errata_012 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.3:errata_013:*:*:*:*:*:* | 7.3 errata_013 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.3:errata_014:*:*:*:*:*:* | 7.3 errata_014 | Vulnerable | OpenBSD |
| cpe:2.3:o:openbsd:openbsd:7.3:errata_015:*:*:*:*:*:* | 7.3 errata_015 | Vulnerable | OpenBSD |
- cpe:2.3:o:openbsd:openbsd:7.3:errata_009:*:*:*:*:*:* Versions 7.3 errata_009 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.3:errata_010:*:*:*:*:*:* Versions 7.3 errata_010 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.3:errata_011:*:*:*:*:*:* Versions 7.3 errata_011 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.3:errata_012:*:*:*:*:*:* Versions 7.3 errata_012 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.3:errata_013:*:*:*:*:*:* Versions 7.3 errata_013 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.3:errata_014:*:*:*:*:*:* Versions 7.3 errata_014 Vulnerable ·OpenBSD
- cpe:2.3:o:openbsd:openbsd:7.3:errata_015:*:*:*:*:*:* Versions 7.3 errata_015 Vulnerable ·OpenBSD
Remediation
- Fix · CNA OpenBSD (OpenBSD) Fixed in 7.3 errata 016
Timeline
- 2026-10-02 Threatist record created from CVE-2023-52557
- 2026-10-03 Alias added: GHSA-fr6m-422w-fv5h
References
More Openbsd vulnerabilities
- TI-2002-00376 Integer overflow in xdr_array function in RPC servers for operating systems that use… CVSS 3.1CRITICAL 9.8
- TI-2003-00437 Off-by-one error in the fb_realpath() function, as derived from the realpath function in… CVSS 3.1CRITICAL 9.8
- TI-2007-05153 Stack-based buffer overflow in the cons_options function in options.c in dhcpd in OpenBSD… CVSS 2.0HIGH 7.2
- TI-2001-00539 Buffer overflow in BSD-based telnetd telnet daemon on various operating systems allows… CVSS 2.0HIGH 10.0
- TI-2026-40218 sppp_pap_input in sys/net/if_spppsubr.c in OpenBSD before 076e2b1 allows authentication… CVSS 3.1HIGH 8.3
- TI-2004-00444 Heap-based buffer overflow in proxy_util.c for mod_proxy in Apache 1.3.25 to 1.3.31… CVSS 2.0HIGH 10.0
Sources
- CVE-2023-52557 · CVE Program
- CVE-2023-52557 · NVD
- FIRST EPSS
- GHSA-fr6m-422w-fv5h · GitHub Advisory Database · CC BY 4.0
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