Libevent
CVE-2015-6525
HIGH
Vulnerability Assessment
| Weakness |
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Numeric handling
|
| Impact | CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity. EPSS exploitation probability: 1.07%. |
| Exploit ScenarioDerived | This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system. |
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Alert meAnalysisAI
Multiple integer overflows in the evbuffer API in Libevent 2.0.x before 2.0.22 and 2.1.x before 2.1.5-beta allow context-dependent attackers to cause a denial of service or possibly have other. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.
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Technical ContextAI · show details
This vulnerability is classified under CWE-189. Multiple integer overflows in the evbuffer API in Libevent 2.0.x before 2.0.22 and 2.1.x before 2.1.5-beta allow context-dependent attackers to cause a denial of service or possibly have other unspecified impact via "insanely large inputs" to the (1) evbuffer_add, (2) evbuffer_prepend, (3) evbuffer_expand, (4) exbuffer_reserve_space, or (5) evbuffer_read function, which triggers a heap-based buffer overflow or an infinite loop. NOTE: this identifier was SPLIT from CVE-2014-6272 per ADT3 due to different affected versions. Affected products include: Debian Debian Linux, Libevent Project Libevent. Version information: before 2.0.22.
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Severity by source
AV:N/AC:L/Au:N/C:P/I:P/A:P
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionCVE.org
Multiple integer overflows in the evbuffer API in Libevent 2.0.x before 2.0.22 and 2.1.x before 2.1.5-beta allow context-dependent attackers to cause a denial of service or possibly have other unspecified impact via "insanely large inputs" to the (1) evbuffer_add, (2) evbuffer_prepend, (3) evbuffer_expand, (4) exbuffer_reserve_space, or (5) evbuffer_read function, which triggers a heap-based buffer overflow or an infinite loop. NOTE: this identifier was SPLIT from CVE-2014-6272 per ADT3 due to different affected versions.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)CVE.org
The name_parse function in evdns.c in libevent before 2.1.6-beta allows remote attackers to have unspecified impact via
The search_make_new function in evdns.c in libevent before 2.1.6-beta allows attackers to cause a denial of service (out
Stack-based buffer overflow in the evutil_parse_sockaddr_port function in evutil.c in libevent before 2.1.6-beta allows
HTTP request smuggling in the libevent evhttp server (http.c) affects all versions prior to 2.1.13 and the 2.2.x-alpha l
Integer overflow in Libevent's event tagging subsystem exposes any application using the evtag API to remote denial of s
Out-of-bounds read in libevent's tagged RPC decoder crashes any application that decodes attacker-controlled tag data us
Heap out-of-bounds write in libevent's bufferevent_sock.c allows any local peer connecting to an AF_UNIX evhttp listener
Multiple integer overflows in the evbuffer API in Libevent 1.4.x before 1.4.15, 2.0.x before 2.0.22, and 2.1.x before 2.
Memory exhaustion in libevent's WebSocket server (ws.c) allows unauthenticated remote clients to crash affected processe
Off-by-one stack buffer overflow in Libevent's evdns component (versions prior to 2.1.13-stable and 2.2.2-alpha) enables
Use-after-free memory corruption in libevent's evbuffer_add_buffer_reference (buffer.c) allows a caller that can drive a
Use-after-free in libevent's WebSocket session initialization (ws.c) before version 2.2.2-alpha allows a local low-privi
GitHub PoC
Exploit-DB