Description
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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libevent | 2.0.21-stable-2 | — |
| Debian 13 | libevent | 2.0.21-stable-2 | — |
| Debian 12 | libevent | 2.0.21-stable-2 | — |
| Debian 7 | libevent | 2.0.19-stable-3+deb7u1 | DSA-3119-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | libevent | 2.0.21-stable-1ubuntu1.14.04.1 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | libevent +2 | 2.0.21-4.amzn2.0.3 | ALAS2-2019-1359 |
Advisories 2
- DSA-3119-1 libevent - security update Debian Security (DSA / DLA) · Mar 9, 2026
- ALAS2-2019-1359 Moderate: libevent security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Nov 14, 2019