How severe is CVE-2021-45290?

CVE-2021-45290 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-2021-45290 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-45290?

CVE-2021-45290 primarily affects Webassembly Binaryen. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-45290?

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-2021-45290 published?

CVE-2021-45290 was published on 2021-12-21 and last updated on 2026-06-17.

CVE-2021-45290

CVE-2021-45290 is a high-severity vulnerability in Webassembly Binaryen 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-617.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-617
Affected product: Webassembly Binaryen
Published: 2021-12-21
Last modified: 2026-06-17

Description

A Denial of Service vulnerability exits in Binaryen 103 due to an assertion abort in wasm::handle_unreachable.

Frequently asked questions

What is CVE-2021-45290?: A Denial of Service vulnerability exits in Binaryen 103 due to an assertion abort in wasm::handle_unreachable.
How severe is CVE-2021-45290?: CVE-2021-45290 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-2021-45290 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-45290?: CVE-2021-45290 primarily affects Webassembly Binaryen. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-45290?: 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-2021-45290 published?: CVE-2021-45290 was published on 2021-12-21 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:webassembly:binaryen:103:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*

More vulnerabilities in Webassembly Binaryen

CVE-2020-18382 — Medium (CVSS 6.5): Heap-buffer-overflow in /src/wasm/wasm-binary.cpp in wasm::WasmBinaryBuilder::visitBlock(wasm::Block*) in Binaryen…
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CVE-2019-7704 — Medium (CVSS 6.5): wasm::WasmBinaryBuilder::readUserSection in wasm-binary.cpp in Binaryen 1.38.22 triggers an attempt at excessive memory…
CVE-2019-7703 — Medium (CVSS 6.5): In Binaryen 1.38.22, there is a use-after-free problem in wasm::WasmBinaryBuilder::visitCall in wasm-binary.cpp. Remote…

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CVE-2020-6623 — High (CVSS 8.8): stb stb_truetype.h through 1.22 has an assertion failure in stbtt__cff_get_index.
CVE-2020-6619 — High (CVSS 8.8): stb stb_truetype.h through 1.22 has an assertion failure in stbtt__buf_seek.

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