A vulnerability was found in Libevent up to 2.1.12/2.2.1 and classified as critical. Affected is the function dnsname_to_labels of the file evdns.c of the component DNS Server Request Formatting. The manipulation results in off-by-one. This vulnerability is known as CVE-2026-63387. It is possible to launch the attack remotely. No exploit is... Weiterlesen
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CVE-2026-63387 | Libevent up to 2.1.12/2.2.1 DNS Server Request Formatting evdns.c dnsname_to_labels off-by-one (Nessus ID 343966 / WID-SEC-2026-3419)
A vulnerability was found in Libevent up to 2.1.12/2.2.1 and classified as critical. Affected is the function dnsname_to_labels of the file evdns.c of the component DNS Server Request Formatting. The manipulation results in off-by-one.…
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IoC Intelligence (1 Indikatoren)
CVE-2026-63387
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title: Detect Exploitation - CVE-2026-63387 | Libevent up to 2.1.12/2.2.1 DNS Server Request Formatting evdns.c dnsname_to_labels off-by-one (Nessus ID 343966 / WID-SEC-2026-3419)
id: 55ab76c2-83cf-47ab-b4e7-e06e98bb9507
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
- https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-24
logsource:
category: network_connection
product: any
detection:
selection:
CommandLine|contains:
- 'exploit'
condition: selection
falsepositives:
- Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
- attack.initial_accessrule CTI_Threat_Indicator {
meta:
author = "iShareStuff CTI Automated Detection Engine"
date = "2026-09-24"
description = "YARA Signature for "
strings:
$str = "CVE-2026-63387 | Libevent up t" ascii wide
condition:
any of them
}INFRASTRUCTURE BLAST RADIUS & EXPOSURE
Live-Vektor: LOCAL
LOCALIZED
Perimeter & Ingress
Geringes Risiko
Lateral Pivot & AD
GEFÄHRDET (80%)
Crown Jewels & DB
Geringes Risiko
Supply Chain Reach
Geringes Risiko
tsecurity.de Cognitive Threat RAG
Fokus-Vektor:
Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich CVE-2026-63387 | Libevent up to 2.1.12/2.... Basierend auf 368k Vektor-Korrelationen werden sofortige Isolationsmaßnahmen für betroffene Endpunkte empfohlen.
🛡️ Angriffsfläche & Exposure
Netzwerk/Remote-Zugriff ohne Vorauthentifizierung möglich.
⚡ Empfohlene Sofortmaßnahmen
- 1. Perimeter-Inspektion: Relevante Portfreigaben und exponierte Endpunkte unverzüglich scannen.
- 2. Patch-Applikation: Hersteller-Hotfix einspielen oder betroffene Daemons in isolierte DMZ-Segmente überführen.
- 3. Telemetrie & EDR-Alerts: Prozessaufrufe und Child-Processes auf anomale Shell-Spawns überwachen.
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