CVE-2015-6525

highpriority · track · 32EPSS 0.048 · 92 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

4.81% (92nd) EPSS

CVSS 7.5 · high

Is it mine?

30 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.4–7.5

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Psecondary · FSTEC (BDU) RU

v2.06.4mediumAV:N/AC:L/Au:N/C:P/I:P/A:P/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-189USprimaryCWE-189US

affected products (30)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
Free Software Foundation, Inc. Libevent2.0.0 → 2.0.22fstec_bduRU
Free Software Foundation, Inc. Libevent2.1.0 → 2.1.5fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 7.1fstec_bduRU
debian debian linux= 7.1nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
libevent project libevent= 2.0.1nvdUScpe:2.3:a:libevent_project:libevent:*:*:*:*:*:*:*:*
libevent project libevent= 2.0.10nvdUScpe:2.3:a:libevent_project:libevent:*:*:*:*:*:*:*:*
libevent project libevent= 2.0.11nvdUScpe:2.3:a:libevent_project:libevent:*:*:*:*:*:*:*:*
libevent project libevent= 2.0.12nvdUScpe:2.3:a:libevent_project:libevent:*:*:*:*:*:*:*:*
libevent project libevent= 2.0.13nvdUScpe:2.3:a:libevent_project:libevent:*:*:*:*:*:*:*:*
libevent project libevent= 2.0.14nvdUScpe:2.3:a:libevent_project:libevent:*:*:*:*:*:*:*:*
libevent project libevent= 2.0.15nvdUScpe:2.3:a:libevent_project:libevent:*:*:*:*:*:*:*:*
libevent project libevent= 2.0.16nvdUScpe:2.3:a:libevent_project:libevent:*:*:*:*:*:*:*:*
libevent project libevent= 2.0.17nvdUScpe:2.3:a:libevent_project:libevent:*:*:*:*:*:*:*:*
libevent project libevent= 2.0.18nvdUScpe:2.3:a:libevent_project:libevent:*:*:*:*:*:*:*:*
libevent project libevent= 2.0.19nvdUScpe:2.3:a:libevent_project:libevent:*:*:*:*:*:*:*:*
libevent project libevent= 2.0.2nvdUScpe:2.3:a:libevent_project:libevent:*:*:*:*:*:*:*:*
libevent project libevent= 2.0.20nvdUScpe:2.3:a:libevent_project:libevent:*:*:*:*:*:*:*:*
libevent project libevent= 2.0.21nvdUScpe:2.3:a:libevent_project:libevent:*:*:*:*:*:*:*:*
libevent project libevent= 2.0.3nvdUScpe:2.3:a:libevent_project:libevent:*:*:*:*:*:*:*:*

showing 20 of 30

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2015-08-24modified 2026-06-17

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+1337 more

references (7)

External citations — patches, advisories, analysis.

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