CVE-2015-2191: Integer overflow in the dissect_tnef function in epan/dissectors/packet-tnef.c in the TNEF dissector in Wiresh

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MEDIUM 5.0WATCHLISTMITIGATEMITIGATEDOWNGRADE

CVE-2015-2191 is a medium-severity flaw (CVSS 5.0) affecting debian linux, mageia, wireshark. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Integer overflow in the dissect_tnef function in epan/dissectors/packet-tnef.c in the TNEF dissector in Wireshark 1.10.x before 1.10.13 and 1.12.x before 1.12.4 allows remote attackers to cause a denial of service (infinite loop) via a crafted length field in a packet.

Why this priority

EPSS top 10%: very likely to be exploited
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	3.9% (top 10%)
CISA exploited list	No
Weakness	CWE-189
Published	2015-03-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · mageia · opensuse · wireshark

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2015-03-08 02:59 UTCPublished CVE record published
2026-06-17 00:23 UTCUpdated Record last modified

debian debian linux MITIGATE

Affected: 7.0 · 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

mageia mageia MITIGATE

Affected: 4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

wireshark wireshark DOWNGRADE

Affected: 1.10.0 · 1.10.1 · 1.10.2 · 1.10.3 · 1.10.4 · 1.10.5 · 1.10.6 · 1.10.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.10.0

1. Check installed version

apt-cache policy wireshark || rpm -q wireshark || wireshark --version

2. No fixed release: DOWNGRADE to a release before 1.10.0 (Debian / Ubuntu)

apt-cache madison wireshark sudo apt install wireshark=<VERSION_BEFORE_1.10.0> sudo apt-mark hold wireshark

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list wireshark sudo dnf downgrade wireshark-<VERSION_BEFORE_1.10.0> sudo dnf versionlock add wireshark

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

opensuse opensuse MITIGATE

Affected: 13.1 · 13.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 13.1

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2015-2191?

debian linux: mitigate or apply the listed mitigation; mageia: mitigate or apply the listed mitigation; wireshark: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-2191 being exploited?

CVE-2015-2191 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2015-2191 affect?

CVE-2015-2191 affects debian linux, mageia, wireshark. Severity is medium (CVSS 5.0). Integer overflow in the dissect_tnef function in epan/dissectors/packet-tnef.c in the TNEF dissector in Wireshark 1.10.x before 1.10.13 and 1.12.x before 1.12.4 allows remote attackers to cause a denial of service (infinite loop) via a craf

How urgent is CVE-2015-2191?

Priority 45/100. EPSS top 10%: very likely to be exploited; On your watchlist

Software pages

Debian vulnerabilities

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References

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