Home/CVE/strongSwan versions 4.5.0 prior to 6.0.5 contain an integer underflow vulnerability in the EAP-TTLS AVP parser that allo
CVE
CVE-2026-25075
strongSwan versions 4.5.0 prior to 6.0.5 contain an integer underflow vulnerability in the EAP-TTLS AVP parser that allo
strongSwan versions 4.5.0 prior to 6.0.5 contain an integer underflow vulnerability in the EAP-TTLS AVP parser that allows unauthenticated remote attackers to cause a denial of service by sending crafted AVP data with invalid length fields during IKEv2 authentication. Attackers can exploit the failure to validate AVP length fields before subtraction to trigger excessive memory allocation or NULL pointer dereference, crashing the charon IKE daemon.
HIGH · CVSS 7.5
EPSS 0.00248
EPSS exploitation odds0.25% · top 51%
Schedule remediation
- SSVC automatable: yes - attacks can be scripted at scale
- CVSS base score ≥ 7.0
No Sigma yet — build one →
YARA rules0
Look this up elsewhere - one-click external pivots
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How to read a CVE - triage first, then detect and patch
This page is every public fact about CVE-2026-25075, cross-linked. Its job is to answer one question fast - does this need my attention now? - and then hand you the two things you do about it. Here is how an analyst reads it.
Triage: should I act now? Four signals, and they are not interchangeable:
CVSSseverity - how bad it is IF exploited, 0-10. A high CVSS alone is not urgency; a flaw can be a perfect 10 and never actually be attacked.
EPSSprobability - a model’s estimate of the chance it is exploited in the next 30 days, 0-1. This is the “will it actually happen” signal.
CISA KEVconfirmed - it is being exploited in the wild right now. The strongest signal on the page; KEV beats any score.
Weaponisedavailability - public exploits / PoCs, and especially Metasploit modules rated Excellent / Great. Reliable, packaged exploit code means low-skill attackers can use it today.
How they combine: KEV, or a dependable Metasploit module, means patch now regardless of CVSS. High CVSS + low EPSS + no exploit is real but not an emergency - schedule it. Low CVSS but KEV-listed still gets patched now. The verdict above already weighed these for you; this is how it got there.
Then what - two workflows:
Detectwhen you cannot patch today, follow this CVE to the ATT&CK techniques it enables, then Build a SIEM detection (the green button) - author a rule, test it in Atomic, deploy it. That buys visibility while the patch waits.
PatchAffected products / packages tell you if you are exposed; Fixed versions by distribution and Vendor advisories give the exact version that closes it.
Reading order for the panels below: verdict + badges, then Public exploits / Metasploit (is it weaponised), then ATT&CK techniques + Sigma / IDS rules (can I detect it), then Affected products / packages + Fixed versions (am I exposed, what patches it), then Threat actors / IOCs (who uses it), then Scoring & timeline / references (the evidence).
EPSS exploitation probability
0.25%
Top 51%odds of exploitation in the next 30 days
CVSS metric silhouette
shape grows toward worst-case
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Tech impact
partial
CVSS vector breakdown
Exploitability - how they get in
Attack Vector
Network
Adjacent
Local
Physical
Attack Complexity
Low
High
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Impact - what breaks
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
VECTOR
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HLifecycle
- 23 Mar 2026Published to NVD
- 04 May 2026Last modified
Every entry is a recorded date - NVD publish/modify, CISA KEV add, public exploit disclosure. No inferred events.
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ATT&CK techniques
1Techniques this CVE enables - linked via CWE → CAPEC → ATT&CK. Pills with a solid outline are named directly in ATT&CK or Nuclei templates (high confidence); the others are linked through weakness mappings.
▤ Build a SIEM detection for these techniques⬡
Weakness Classification
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Related CVEs
8CVEs linked to this one by a shared weakness (CWE) or affected product - joins on data already in the engine, with the reason shown per row. Not a guess.
CVE-2004-0184
Integer underflow in the isakmp_id_print for TCPDUMP 3.8.1 and earlier allows re...
same CWE-191
CVE-2004-0816
Integer underflow in the firewall logging rules for iptables in Linux before 2.6...
same CWE-191
HIGH
CVE-2004-1002
Integer underflow in pppd in cbcp.c for ppp 2.4.1 allows remote attackers to cau...
same CWE-191
HIGH
CVE-2005-0199
Integer underflow in the Lists_MakeMask() function in lists.c in ngIRCd before 0...
same CWE-191
CRITICAL
CVE-1999-0052
IP fragmentation denial of service in FreeBSD allows a remote attacker to cause ...
same CWE-476
HIGH
CVE-2001-1559
The uipc system calls (uipc_syscalls.c) in OpenBSD 2.9 and 3.0 provide user mode...
same CWE-476
MEDIUM
CVE-2002-0401
SMB dissector in Ethereal 0.9.3 and earlier allows remote attackers to cause a d...
same CWE-476
HIGH
CVE-2002-1912
SkyStream EMR5000 1.16 through 1.18 does not drop packets or disable the Etherne...
same CWE-476
HIGH
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Vendor Advisories
10suse-csafopenSUSE-SU-2026:20547-1
suse-csafSUSE-SU-2026:21203-1
suse-csafSUSE-SU-2026:1307-1
suse-csafopenSUSE-SU-2026:10441-1
msrcCVE-2026-25075
usnUSN-8117-1
suse-csafSUSE-SU-2026:0978-1
suse-csafSUSE-SU-2026:0979-1
suse-csafSUSE-SU-2026:0980-1
suse-csafSUSE-SU-2026:0981-1
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References & Sources
5Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.