How severe is CVE-2018-0490?

CVE-2018-0490 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-0490 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-0490?

CVE-2018-0490 primarily affects Debian Debian Linux. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-0490?

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-2018-0490 published?

CVE-2018-0490 was published on 2018-03-05 and last updated on 2026-06-17.

CVE-2018-0490

CVE-2018-0490 is a high-severity vulnerability in Debian Debian Linux with a CVSS 3.x base score of 7.5. 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-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Debian Debian Linux
Published: 2018-03-05
Last modified: 2026-06-17

Description

An issue was discovered in Tor before 0.2.9.15, 0.3.1.x before 0.3.1.10, and 0.3.2.x before 0.3.2.10. The directory-authority protocol-list subprotocol implementation allows remote attackers to cause a denial of service (NULL pointer dereference and directory-authority crash) via a misformatted relay descriptor that is mishandled during voting.

Frequently asked questions

What is CVE-2018-0490?: An issue was discovered in Tor before 0.2.9.15, 0.3.1.x before 0.3.1.10, and 0.3.2.x before 0.3.2.10. The directory-authority protocol-list subprotocol implementation allows remote attackers to cause a denial of service (NULL pointer dereference and directory-authority crash) via a misformatted relay descriptor that is mishandled during voting.
How severe is CVE-2018-0490?: CVE-2018-0490 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-0490 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-0490?: CVE-2018-0490 primarily affects Debian Debian Linux. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-0490?: 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-2018-0490 published?: CVE-2018-0490 was published on 2018-03-05 and last updated on 2026-06-17.

References

Affected products (17)

cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.1.1:alpha:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.1.2:alpha:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.1.3:alpha:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.1.4:alpha:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.1.5:alpha:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.1.6:rc:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.2.1:alpha:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.2.2:alpha:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.2.3:alpha:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.2.4:alpha:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.2.5:alpha:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.2.6:alpha:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.2.7:rc:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.2.8:rc:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.2.9:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

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