How severe is CVE-2021-33461?

CVE-2021-33461 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-33461 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33461?

CVE-2021-33461 affects Tortall Yasm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-33461?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-33461 published?

CVE-2021-33461 was published on 2022-07-26 and last updated on 2026-06-17.

CVE-2021-33461

CVE-2021-33461 is a medium-severity vulnerability in Tortall Yasm with a CVSS 3.x base score of 5.5. 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-416.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-416
Affected product: Tortall Yasm
Published: 2022-07-26
Last modified: 2026-06-17

Description

An issue was discovered in yasm version 1.3.0. There is a use-after-free in yasm_intnum_destroy() in libyasm/intnum.c.

Frequently asked questions

What is CVE-2021-33461?: An issue was discovered in yasm version 1.3.0. There is a use-after-free in yasm_intnum_destroy() in libyasm/intnum.c.
How severe is CVE-2021-33461?: CVE-2021-33461 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-33461 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33461?: CVE-2021-33461 affects Tortall Yasm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-33461?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-33461 published?: CVE-2021-33461 was published on 2022-07-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:tortall:yasm:1.3.0:*:*:*:*:*:*:*

More vulnerabilities in Tortall Yasm

CVE-2023-51258 — Medium (CVSS 5.5): A memory leak issue discovered in YASM v.1.3.0 allows a local attacker to cause a denial of service via the new_Token…
CVE-2023-31973 — Medium (CVSS 5.5): yasm v1.3.0 was discovered to contain a use after free via the function expand_mmac_params at /nasm/nasm-pp.c. Note:…
CVE-2023-31974 — Medium (CVSS 5.5): yasm v1.3.0 was discovered to contain a use after free via the function error at /nasm/nasm-pp.c. Note: Multiple third…
CVE-2023-31972 — Medium (CVSS 5.5): yasm v1.3.0 was discovered to contain a use after free via the function pp_getline at /nasm/nasm-pp.c. Note: Multiple…
CVE-2021-33468 — Medium (CVSS 5.5): An issue was discovered in yasm version 1.3.0. There is a use-after-free in error() in modules/preprocs/nasm/nasm-pp.c.
CVE-2021-33467 — Medium (CVSS 5.5): An issue was discovered in yasm version 1.3.0. There is a use-after-free in pp_getline() in…

All CVEs affecting Tortall Yasm →

Other CWE-416 (Use After Free) vulnerabilities

CVE-2026-13782 — Critical (CVSS 10.0): Use after free in Browser in Google Chrome prior to 150.0.7871.47 allowed a remote attacker who had compromised the…
CVE-2026-4725 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149…
CVE-2026-4688 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox…
CVE-2025-24085 — Critical (CVSS 10.0): A use after free issue was addressed with improved memory management. This issue is fixed in iOS 18.3 and iPadOS 18.3,…
CVE-2024-43102 — Critical (CVSS 10.0): Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of…
CVE-2021-32495 — Critical (CVSS 10.0): Radare2 has a use-after-free vulnerability in pyc parser's get_none_object function. Attacker can read freed memory…

Browse all CWE-416 (Use After Free) vulnerabilities →