How severe is CVE-2017-20006?

CVE-2017-20006 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-20006 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-2017-20006?

CVE-2017-20006 primarily affects Rarlab Unrar. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-20006?

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-2017-20006 published?

CVE-2017-20006 was published on 2021-07-01 and last updated on 2026-06-17.

CVE-2017-20006

CVE-2017-20006 is a high-severity vulnerability in Rarlab Unrar with a CVSS 3.x base score of 7.8. 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-787.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Rarlab Unrar
Published: 2021-07-01
Last modified: 2026-06-17

Description

UnRAR 5.6.1.2 and 5.6.1.3 has a heap-based buffer overflow in Unpack::CopyString (called from Unpack::Unpack5 and CmdExtract::ExtractCurrentFile).

Frequently asked questions

What is CVE-2017-20006?: UnRAR 5.6.1.2 and 5.6.1.3 has a heap-based buffer overflow in Unpack::CopyString (called from Unpack::Unpack5 and CmdExtract::ExtractCurrentFile).
How severe is CVE-2017-20006?: CVE-2017-20006 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-20006 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-2017-20006?: CVE-2017-20006 primarily affects Rarlab Unrar. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-20006?: 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-2017-20006 published?: CVE-2017-20006 was published on 2021-07-01 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:rarlab:unrar:5.6.1.2:*:*:*:*:*:*:*
cpe:2.3:a:rarlab:unrar:5.6.1.3:*:*:*:*:*:*:*

More vulnerabilities in Rarlab Unrar

CVE-2017-12942 — Critical (CVSS 9.8): libunrar.a in UnRAR before 5.5.7 has a buffer overflow in the Unpack::LongLZ function.
CVE-2017-12941 — Critical (CVSS 9.8): libunrar.a in UnRAR before 5.5.7 has an out-of-bounds read in the Unpack::Unpack20 function.
CVE-2017-12940 — Critical (CVSS 9.8): libunrar.a in UnRAR before 5.5.7 has an out-of-bounds read in the EncodeFileName::Decode call within the…
CVE-2012-6706 — Critical (CVSS 9.8): A VMSF_DELTA memory corruption was discovered in unrar before 5.5.5, as used in Sophos Anti-Virus Threat Detection…
CVE-2017-14122 — Critical (CVSS 9.1): unrar 0.0.1 (aka unrar-free or unrar-gpl) suffers from a stack-based buffer over-read in unrarlib.c, related to…
CVE-2018-25018 — High (CVSS 7.8): UnRAR 5.6.1.7 through 5.7.4 and 6.0.3 has an out-of-bounds write during a memcpy in QuickOpen::ReadRaw when called from…

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