libevent: potential heap overflow in buffer/bufferevent APIs
Published Aug 24, 2015
7.5
HIGHCVSS 2.0
EPSS 2.08%
Description
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 2.1.5-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_expand, or (3) bufferevent_write function, which triggers a heap-based buffer overflow or an infinite loop. NOTE: this identifier has been SPLIT per ADT3 due to different affected versions. See CVE-2015-6525 for the functions that are only affected in 2.0 and later.
Affected products
No data.
Configuration 1
- 7.0
Configuration 2
- 1.4.0
- 1.4.1
- 1.4.2
- 1.4.3
- 1.4.4
- 1.4.5
- 1.4.6
- 1.4.7
- 1.4.8
- 1.4.9
- 1.4.10
- 1.4.11
- 1.4.12
- 1.4.13
- 1.4.14
- 2.0.1
- 2.0.2
- 2.0.3
- 2.0.4
- 2.0.5
- 2.0.6
- 2.0.7
- 2.0.8
- 2.0.9
- 2.0.10
- 2.0.11
- 2.0.12
- 2.0.13
- 2.0.14
- 2.0.15
- 2.0.16
- 2.0.17
- 2.0.18
- 2.0.19
- 2.0.20
- 2.0.21
- 2.1.1
- 2.1.2
- 2.1.3
- 2.1.4
No data.
Red Hat Enterprise Linux 4
nfs-utils
Will not fix
Red Hat Enterprise Linux 4
openmpi
Will not fix
Red Hat Enterprise Linux 5
firefox
Will not fix
Red Hat Enterprise Linux 5
libevent
Will not fix
Red Hat Enterprise Linux 5
openmpi
Not affected
Red Hat Enterprise Linux 5
thunderbird
Will not fix
Red Hat Enterprise Linux 6
chromium-browser
Will not fix
Red Hat Enterprise Linux 6
firefox
Will not fix
Red Hat Enterprise Linux 6
libevent
Will not fix
Red Hat Enterprise Linux 6
openmpi
Not affected
Red Hat Enterprise Linux 6
thunderbird
Will not fix
Red Hat Enterprise Linux 7
firefox
Will not fix
Red Hat Enterprise Linux 7
libevent
Will not fix
Red Hat Enterprise Linux 7
openmpi
Not affected
Red Hat Enterprise Linux 7
thunderbird
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | nfs-utils | Will not fix | n/a |
| Red Hat Enterprise Linux 4 | openmpi | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | firefox | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | libevent | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | openmpi | Not affected | n/a |
| Red Hat Enterprise Linux 5 | thunderbird | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | chromium-browser | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | firefox | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | libevent | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | openmpi | Not affected | n/a |
| Red Hat Enterprise Linux 6 | thunderbird | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | firefox | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | libevent | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | openmpi | Not affected | n/a |
| Red Hat Enterprise Linux 7 | thunderbird | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.08% (0.02084) | 80.87th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.08% (0.02084) | 79.05th | v5 (v2026.06.15) |
| Mar 30, 2025 | 1.08% (0.01085) | 75.89th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.36% (0.02363) | 74.90th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.08% (0.01085) | 76.34th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.46% (0.00455) | 76.05th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.46% (0.00455) | 74.49th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.46% (0.00455) | 71.33th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.02% (0.01018) | 40.69th | v2 (v2022.01.01) |
| Sep 10, 2022 | 1.02% (0.01018) | 38.88th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.02% (0.01018) | 36.86th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.02% (0.01018) | 19.50th | v2 (v2022.01.01) |
References (8)
- http://archives.seul.org/libevent/users/Jan-2015/msg00010.html mailing-listx_refsource_MLISTVendor Advisory
- http://www.debian.org/security/2015/dsa-3119 vendor-advisoryx_refsource_DEBIAN
- http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.366317 vendor-advisoryx_refsource_SLACKWARE
- https://access.redhat.com/security/cve/CVE-2014-6272 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1144646 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2014-6272
- https://puppet.com/security/cve/CVE-2014-6272 x_refsource_CONFIRM
- https://www.cve.org/CVERecord?id=CVE-2014-6272
| Link | Providers | Tags |
|---|---|---|
| http://archives.seul.org/libevent/users/Jan-2015/msg00010.html | mailing-listx_refsource_MLISTVendor Advisory | |
| http://www.debian.org/security/2015/dsa-3119 | vendor-advisoryx_refsource_DEBIAN | |
| http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.366317 | vendor-advisoryx_refsource_SLACKWARE | |
| https://access.redhat.com/security/cve/CVE-2014-6272 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1144646 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2014-6272 | ||
| https://puppet.com/security/cve/CVE-2014-6272 | x_refsource_CONFIRM | |
| https://www.cve.org/CVERecord?id=CVE-2014-6272 |
Change history (0)
No recorded changes yet.