How severe is CVE-2017-3158?

CVE-2017-3158 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-3158 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-3158?

CVE-2017-3158 primarily affects Apache Guacamole. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-3158?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2017-3158 published?

CVE-2017-3158 was published on 2018-01-18 and last updated on 2026-06-17.

CVE-2017-3158

CVE-2017-3158 is a high-severity vulnerability in Apache Guacamole with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-362.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.8
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-362
Affected product: Apache Guacamole
Published: 2018-01-18
Last modified: 2026-06-17

Description

A race condition in Guacamole's terminal emulator in versions 0.9.5 through 0.9.10-incubating could allow writes of blocks of printed data to overlap. Such overlapping writes could cause packet data to be misread as the packet length, resulting in the remaining data being written beyond the end of a statically-allocated buffer.

Frequently asked questions

What is CVE-2017-3158?: A race condition in Guacamole's terminal emulator in versions 0.9.5 through 0.9.10-incubating could allow writes of blocks of printed data to overlap. Such overlapping writes could cause packet data to be misread as the packet length, resulting in the remaining data being written beyond the end of a statically-allocated buffer.
How severe is CVE-2017-3158?: CVE-2017-3158 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-3158 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-3158?: CVE-2017-3158 primarily affects Apache Guacamole. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-3158?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2017-3158 published?: CVE-2017-3158 was published on 2018-01-18 and last updated on 2026-06-17.

References

https://lists.apache.org/thread.html/b218d36bfdaf655d27382daec4dcd02ec717631f4aee8b7e4300ad65%40%3Cuser.guacamole.apache.org%3E

Affected products (2)

cpe:2.3:a:apache:guacamole:*:*:*:*:*:*:*:*
cpe:2.3:a:apache:guacamole:0.9.10-incubating:*:*:*:*:*:*:*

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