Read the docs
TI-2015-05481 Aliases CVE-2015-6525GHSA-xfhg-qx7p-6gx5

Multiple integer overflows in the evbuffer API in Libevent 2.0.x before 2.0.22 and 2.1.x…

Priority MEDIUM 41CWE-189Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
— Not recorded in CVSS 2.0
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
Partial · Partial · Partial
Fix status
Will not fix Red Hat: no fix planned

Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-189 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.04813 92nd percentileScored 2026-11-07
Fix Will not fix Red Hat: no fix planned

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 26

CPEVersionsRoleVendor
cpe:2.3:o:debian:debian_linux:7.1:*:*:*:*:*:*:*7.1VulnerableDebian
cpe:2.3:a:libevent_project:libevent:2.0.1:*:*:*:*:*:*:*2.0.1VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.0.2:*:*:*:*:*:*:*2.0.2VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.0.3:*:*:*:*:*:*:*2.0.3VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.0.4:*:*:*:*:*:*:*2.0.4VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.0.5:*:*:*:*:*:*:*2.0.5VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.0.6:*:*:*:*:*:*:*2.0.6VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.0.7:*:*:*:*:*:*:*2.0.7VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.0.8:*:*:*:*:*:*:*2.0.8VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.0.9:*:*:*:*:*:*:*2.0.9VulnerableLibevent Project
  • cpe:2.3:o:debian:debian_linux:7.1:*:*:*:*:*:*:* Versions 7.1 Vulnerable ·Debian
  • cpe:2.3:a:libevent_project:libevent:2.0.1:*:*:*:*:*:*:* Versions 2.0.1 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.2:*:*:*:*:*:*:* Versions 2.0.2 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.3:*:*:*:*:*:*:* Versions 2.0.3 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.4:*:*:*:*:*:*:* Versions 2.0.4 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.5:*:*:*:*:*:*:* Versions 2.0.5 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.6:*:*:*:*:*:*:* Versions 2.0.6 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.7:*:*:*:*:*:*:* Versions 2.0.7 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.8:*:*:*:*:*:*:* Versions 2.0.8 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.9:*:*:*:*:*:*:* Versions 2.0.9 Vulnerable ·Libevent Project
Show 16 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:libevent_project:libevent:2.0.10:*:*:*:*:*:*:*2.0.10VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.0.11:*:*:*:*:*:*:*2.0.11VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.0.12:*:*:*:*:*:*:*2.0.12VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.0.13:*:*:*:*:*:*:*2.0.13VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.0.14:*:*:*:*:*:*:*2.0.14VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.0.15:*:*:*:*:*:*:*2.0.15VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.0.16:*:*:*:*:*:*:*2.0.16VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.0.17:*:*:*:*:*:*:*2.0.17VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.0.18:*:*:*:*:*:*:*2.0.18VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.0.19:*:*:*:*:*:*:*2.0.19VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.0.20:*:*:*:*:*:*:*2.0.20VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.0.21:*:*:*:*:*:*:*2.0.21VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.1.1:*:*:*:*:*:*:*2.1.1VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.1.2:*:*:*:*:*:*:*2.1.2VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.1.3:*:*:*:*:*:*:*2.1.3VulnerableLibevent Project
cpe:2.3:a:libevent_project:libevent:2.1.4:*:*:*:*:*:*:*2.1.4VulnerableLibevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.10:*:*:*:*:*:*:* Versions 2.0.10 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.11:*:*:*:*:*:*:* Versions 2.0.11 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.12:*:*:*:*:*:*:* Versions 2.0.12 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.13:*:*:*:*:*:*:* Versions 2.0.13 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.14:*:*:*:*:*:*:* Versions 2.0.14 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.15:*:*:*:*:*:*:* Versions 2.0.15 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.16:*:*:*:*:*:*:* Versions 2.0.16 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.17:*:*:*:*:*:*:* Versions 2.0.17 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.18:*:*:*:*:*:*:* Versions 2.0.18 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.19:*:*:*:*:*:*:* Versions 2.0.19 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.20:*:*:*:*:*:*:* Versions 2.0.20 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.0.21:*:*:*:*:*:*:* Versions 2.0.21 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.1.1:*:*:*:*:*:*:* Versions 2.1.1 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.1.2:*:*:*:*:*:*:* Versions 2.1.2 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.1.3:*:*:*:*:*:*:* Versions 2.1.3 Vulnerable ·Libevent Project
  • cpe:2.3:a:libevent_project:libevent:2.1.4:*:*:*:*:*:*:* Versions 2.1.4 Vulnerable ·Libevent Project

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 5AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux 7AffectedNo fix planned: Will not fix
Not affected: 4 products
  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2015-6525
  2. 2026-10-03 Alias added: GHSA-xfhg-qx7p-6gx5

References

Advisory 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences