CVE-2018-20991
CVE-2018-20991 is a critical-severity vulnerability in Servo Smallvec with a CVSS 3.x base score of 9.8. 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-415.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 7.5
- EPSS exploit prediction: 2% (76th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-415
- Affected product: Servo Smallvec
- Published:
- Last modified:
Description
An issue was discovered in the smallvec crate before 0.6.3 for Rust. The Iterator implementation mishandles destructors, leading to a double free.
Frequently asked questions
- What is CVE-2018-20991?
- An issue was discovered in the smallvec crate before 0.6.3 for Rust. The Iterator implementation mishandles destructors, leading to a double free.
- How severe is CVE-2018-20991?
- CVE-2018-20991 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2018-20991 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2018-20991?
- CVE-2018-20991 affects Servo Smallvec. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2018-20991?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2018-20991 published?
- CVE-2018-20991 was published on 2019-08-26 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:servo:smallvec:*:*:*:*:*:*:*:*
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- CVE-2019-15551 — Critical (CVSS 9.8): An issue was discovered in the smallvec crate before 0.6.10 for Rust. There is a double free for certain grow attempts…
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