KDE Konsole before 25.04.2 allows remote code execution in a certain scenario. It supports loading URLs from the scheme handlers such as a ssh:// or telnet:// or rlogin:// URL. This can be executed regardless of whether the ssh, telnet, or rlogin binary is available. In this mode, there is a code path where if that binary is not available, Konsole falls back to using /bin/bash for the given arguments (i.e., the URL) provided. This allows an attacker to execute arbitrary code.

The remote Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8752-1 advisory.

    It was discovered that Konsole incorrectly handled certain URLs under specific circumstances. A remote     attacker could possibly use this issue to execute arbitrary code.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of Tencent Linux installed on the remote TencentOS Server 2 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2025:1022 advisory.

    Package updates are available for TencentOS Server 2 that fix the following vulnerabilities:

    CVE-2025-49091:
    KDE Konsole before 25.04.2 allows remote code execution in a certain scenario. It supports loading URLs     from the scheme handlers such as a ssh:// or telnet:// or rlogin:// URL. This can be executed regardless     of whether the ssh, telnet, or rlogin binary is available. In this mode, there is a code path where if     that binary is not available, Konsole falls back to using /bin/bash for the given arguments (i.e., the     URL) provided. This allows an attacker to execute arbitrary code.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - KDE Konsole before 25.04.2 allows remote code execution in a certain scenario. It supports loading URLs     from the scheme handlers such as a ssh:// or telnet:// or rlogin:// URL. This can be executed regardless     of whether the ssh, telnet, or rlogin binary is available. In this mode, there is a code path where if     that binary is not available, Konsole falls back to using /bin/bash for the given arguments (i.e., the     URL) provided. This allows an attacker to execute arbitrary code. (CVE-2025-49091)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Oracle Linux 7 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2025-12346 advisory.

    [4.10.5-5.0.1]
    - Clear the arguments if the command is not found [Orabug: 38260855][CVE-2025-49091]

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2025:12346 advisory.

    KDE Terminal emulator.

    Security Fix(es):

    * konsole: Konsole Remote Code Execution Vulnerability (CVE-2025-49091)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Debian 12 host has packages installed that are affected by a vulnerability as referenced in the dsa-5945 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-5945-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     June 20, 2025                         https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : konsole     CVE ID         : CVE-2025-49091

    Dennis Dast discovered that the Konsole terminal emulator insecurely     handled the telnet URI scheme, which could result in the execution     of arbitrary code in some configurations.

    For the stable distribution (bookworm), this problem has been fixed in     version 4:22.12.3-1+deb12u1.

    We recommend that you upgrade your konsole packages.

    For the detailed security status of konsole please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/konsole

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dla-4220 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4220-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                           Chris Lamb     June 17, 2025                                 https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : konsole     Version        : 4:20.12.3-1+deb11u1     CVE ID         : CVE-2025-49091     Debian Bug     : 1107672

    It was discovered that there was a potential remote code execution     vulnerability in konsole, the X terminal emulator of the KDE desktop     environmne.t

    This vulnerability could have been exploited when loading URLs from     scheme handlers such as a ssh:// or telnet://.

    For Debian 11 bullseye, this problem has been fixed in version     4:20.12.3-1+deb11u1.

    We recommend that you upgrade your konsole packages.

    For the detailed security status of konsole please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/konsole

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote host is affected by the vulnerability described in GLSA-202506-13 (Konsole: Code execution)

    Konsole supports loading URLs from the scheme handlers such as telnet://URL. This can be executed     regardless of whether the telnet binary is available. It would fallback to bash in that case and execute     arbitrary code.

Tenable has extracted the preceding description block directly from the Gentoo Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
345853	Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS : Konsole vulnerability (USN-8752-1)	Nessus	Ubuntu Local Security Checks	Local	high
324642	TencentOS Server 2: konsole (TSSA-2025:1022)	Nessus	Tencent Local Security Checks	Local	high
251968	Linux Distros Unpatched Vulnerability : CVE-2025-49091	Nessus	Misc.	Local	high
249255	Oracle Linux 7 : konsole (ELSA-2025-12346)	Nessus	Oracle Linux Local Security Checks	Local	high
243228	RHEL 7 : konsole (RHSA-2025:12346)	Nessus	Red Hat Local Security Checks	Local	high
240218	Debian dsa-5945 : konsole - security update	Nessus	Debian Local Security Checks	Local	high
240150	Debian dla-4220 : konsole - security update	Nessus	Debian Local Security Checks	Local	high
238468	GLSA-202506-13 : Konsole: Code execution	Nessus	Gentoo Local Security Checks	Local	high

Detections

Analytics

CVE-2025-49091

high

Tenable Plugins

high

high

high

high

high

high

high

high