CVE-2021-33631

CVE-2021-33631 is a medium-severity vulnerability in Openatom Openeuler 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-190.

Key facts

• Severity: Medium (CVSS 3.x base score 5.5)
• EPSS exploit prediction: 0% (29th percentile)
• Actively exploited: Not listed in CISA KEV
• EU (EUVD) id: EUVD-2021-20308
• Weakness: CWE-190
• Affected product: Openatom Openeuler
• Published: 2024-01-18
• Last modified: 2026-06-17

Description

Integer Overflow or Wraparound vulnerability in openEuler kernel on Linux (filesystem modules) allows Forced Integer Overflow.This issue affects openEuler kernel: from 4.19.90 before 4.19.90-2401.3, from 5.10.0-60.18.0 before 5.10.0-183.0.0.

Frequently asked questions

What is CVE-2021-33631?

Integer Overflow or Wraparound vulnerability in openEuler kernel on Linux (filesystem modules) allows Forced Integer Overflow.This issue affects openEuler kernel: from 4.19.90 before 4.19.90-2401.3, from 5.10.0-60.18.0 before 5.10.0-183.0.0.

How severe is CVE-2021-33631?

CVE-2021-33631 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-33631 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33631?

CVE-2021-33631 primarily affects Openatom Openeuler. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-33631?

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

Does CVE-2021-33631 have an EU (EUVD) identifier?

Yes. CVE-2021-33631 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-20308.

When was CVE-2021-33631 published?

CVE-2021-33631 was published on 2024-01-18 and last updated on 2026-06-17.

References

• http://www.openwall.com/lists/oss-security/2024/01/30/10
• http://www.openwall.com/lists/oss-security/2024/01/30/3
• http://www.openwall.com/lists/oss-security/2024/01/30/4
• http://www.openwall.com/lists/oss-security/2024/01/30/5
• http://www.openwall.com/lists/oss-security/2024/01/30/9
• http://www.openwall.com/lists/oss-security/2024/01/31/2
• http://www.openwall.com/lists/oss-security/2024/01/31/3
• http://www.openwall.com/lists/oss-security/2024/02/02/6
• http://www.openwall.com/lists/oss-security/2024/02/02/9
• http://www.openwall.com/lists/oss-security/2024/02/03/1
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5c099c4fdc438014d5893629e70a8ba934433ee8
• https://gitee.com/src-openeuler/kernel/pulls/1389
• https://gitee.com/src-openeuler/kernel/pulls/1396
• https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-1030
• https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-1031
• https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-1032
• https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-1033
• https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-1034
• https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-1035

Affected products (2)

• cpe:2.3:o:openatom:openeuler:*:*:*:*:-:-:*:*
• cpe:2.3:o:openatom:openeuler:*:*:*:*:-:linux:*:*

More vulnerabilities in Openatom Openeuler

• CVE-2021-33643 — Critical (CVSS 9.1): An attacker who submits a crafted tar file with size in header struct being 0 may be able to trigger an calling of…
• CVE-2021-33644 — High (CVSS 8.1): An attacker who submits a crafted tar file with size in header struct being 0 may be able to trigger an calling of…
• CVE-2021-33646 — High (CVSS 7.5): The th_read() function doesn’t free a variable t->th_buf.gnu_longname after allocating memory, which may cause a…
• CVE-2021-33645 — High (CVSS 7.5): The th_read() function doesn’t free a variable t->th_buf.gnu_longlink after allocating memory, which may cause a…
• CVE-2021-33656 — Medium (CVSS 6.8): When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.
• CVE-2021-33640 — Medium (CVSS 6.2): After tar_close(), libtar.c releases the memory pointed to by pointer t. After tar_close() is called in the list()…

All CVEs affecting Openatom Openeuler →

Other CWE-190 (Integer Overflow or Wraparound) vulnerabilities

• CVE-2026-4689 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was…
• CVE-2026-24814 — Critical (CVSS 10.0): Integer Overflow or Wraparound vulnerability in swoole swoole-src (thirdparty/hiredis modules). This vulnerability is…
• CVE-2025-64721 — Critical (CVSS 10.0): Sandboxie is a sandbox-based isolation software for 32-bit and 64-bit Windows NT-based operating systems. In versions…
• CVE-2015-5108 — Critical (CVSS 10.0): Integer overflow in Adobe Reader and Acrobat 10.x before 10.1.15 and 11.x before 11.0.12, Acrobat and Acrobat Reader DC…
• CVE-2015-5097 — Critical (CVSS 10.0): Integer overflow in Adobe Reader and Acrobat 10.x before 10.1.15 and 11.x before 11.0.12, Acrobat and Acrobat Reader DC…
• CVE-2013-2555 — Critical (CVSS 10.0): Integer overflow in Adobe Flash Player before 10.3.183.75 and 11.x before 11.7.700.169 on Windows and Mac OS X, before…

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