CVE-2017-8911
An integer underflow has been identified in the unicode_to_utf8() function in tnef 1.4.14. This...
An integer underflow has been identified in the unicode_to_utf8() function in tnef 1.4.14. This might lead to invalid write operations, controlled by an attacker.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
An integer underflow has been identified in the unicode_to_utf8() function in tnef 1.4.14. This might lead to invalid write operations, controlled by an attacker.
- Record
CVE-2017-8911- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-191
- Updated
- 2026-11-02
CVE List No score
An integer underflow has been identified in the unicode_to_utf8() function in tnef 1.4.14. This might lead to invalid write operations, controlled by an attacker.
- Record
CVE-2017-8911- Updated
- 2026-11-02
EUVDEUVD-2017-17851 No score
An integer underflow has been identified in the unicode_to_utf8() function in tnef 1.4.14. This might lead to invalid write operations, controlled by an attacker.
- Record
EUVD-2017-17851- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-575j-8r4j-2fmq
An integer underflow has been identified in the unicode_to_utf8() function in tnef 1.4.14. This...
An integer underflow has been identified in the unicode_to_utf8() function in tnef 1.4.14. This might lead to invalid write operations, controlled by an attacker.
- Record
GHSA-575j-8r4j-2fmq- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-191
- Updated
- 2026-11-02
OSV
An integer underflow has been identified in the unicode_to_utf8() function in tnef 1.4.14. This might lead to invalid write operations, controlled by an attacker.
- Record
CVE-2017-8911- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2017-8911
An integer underflow has been identified in the unicode_to_utf8() function in tnef 1.4.14. This might lead to invalid write operations, controlled by an attacker.
- Record
DEBIAN-CVE-2017-8911- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2017-8911
An integer underflow has been identified in the unicode_to_utf8() function in tnef 1.4.14. This might lead to invalid write operations, controlled by an attacker.
- Record
UBUNTU-CVE-2017-8911- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVMGASA-2017-0209 No score
Updated tnef packages fix security vulnerability
It was discovered that tnef did not correctly validate its input. An attacker could exploit this by tricking a user into opening a malicious attachment, which would result in a denial-of-service by application crash (CVE-2017-8911).
- Record
MGASA-2017-0209- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:11467-1 No score
tnef-1.4.18-1.6 on GA media
These are all security issues fixed in the tnef-1.4.18-1.6 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:11467-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
tnefDebian:12 |
before 1.4.12-1.2 | 1.4.12-1.2 |
tnefDebian:13 |
before 1.4.12-1.2 | 1.4.12-1.2 |
tnefDebian:14 |
before 1.4.12-1.2 | 1.4.12-1.2 |
tnefDebian:7 |
before 1.4.9-1+deb7u3, plus listed versions 1.4.9-11.4.9-1+deb7u11.4.9-1+deb7u2 |
1.4.9-1+deb7u3 |
tnefDebian:8 |
before 1.4.9-1+deb8u3, plus listed versions 1.4.9-11.4.9-1+deb8u11.4.9-1+deb8u2 |
1.4.9-1+deb8u3 |
tnefMageia:5 |
before 1.4.15-1.mga5 | 1.4.15-1.mga5 |
tnefUbuntu:14.04:LTS |
before 1.4.9-1+deb8u3build0.14.04.1, plus listed versions 1.4.9-11.4.9-1+deb8u2build0.14.04.1 |
1.4.9-1+deb8u3build0.14.04.1 |
tnefUbuntu:16.04:LTS |
before 1.4.9-1+deb8u3build0.16.04.1, plus listed versions 1.4.9-11.4.9-1+deb8u2build0.16.04.1 |
1.4.9-1+deb8u3build0.16.04.1 |
tnefopenSUSE:Tumbleweed |
before 1.4.18-1.6 | 1.4.18-1.6 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2017-8911 is a critical vulnerability (CVSS 9.8) in Tnef Project Tnef, published May 12, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.93%, the 80th percentile. Fixed in tnef 1.4.12-1.2.