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CVE-2020-21528

A Segmentation Fault issue discovered in in ieee_segment function in outieee.c in nasm 2.14.03...

5.5 MediumFix available

A Segmentation Fault issue discovered in in ieee_segment function in outieee.c in nasm 2.14.03 and 2.15 allows remote attackers to cause a denial of service via crafted assembly file.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.54%Up 0.5 points since Aug 23, 2023
90%50%10%1%

What each source reports

NVD Score used 5.5

A Segmentation Fault issue discovered in in ieee_segment function in outieee.c in nasm 2.14.03 and 2.15 allows remote attackers to cause a denial of service via crafted assembly file.

Record
CVE-2020-21528
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
CVE List No score

A Segmentation Fault issue discovered in in ieee_segment function in outieee.c in nasm 2.14.03 and 2.15 allows remote attackers to cause a denial of service via crafted assembly file.

Record
CVE-2020-21528
Updated
2026-11-02
EUVDEUVD-2020-14296 No score

A Segmentation Fault issue discovered in in ieee_segment function in outieee.c in nasm 2.14.03 and 2.15 allows remote attackers to cause a denial of service via crafted assembly file.

Record
EUVD-2020-14296
Updated
2026-11-03
GitHub AdvisoriesGHSA-hfwj-q2m5-23m2 5.5

A Segmentation Fault issue discovered in in ieee_segment function in outieee.c in nasm 2.14.03...

A Segmentation Fault issue discovered in in ieee_segment function in outieee.c in nasm 2.14.03 and 2.15 allows remote attackers to cause a denial of service via crafted assembly file.

Record
GHSA-hfwj-q2m5-23m2
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVBELL-CVE-2020-21528 5.5
Record
BELL-CVE-2020-21528
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSV 5.5

A Segmentation Fault issue discovered in in ieee_segment function in outieee.c in nasm 2.14.03 and 2.15 allows remote attackers to cause a denial of service via crafted assembly file.

Record
CVE-2020-21528
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 4 moreShow less
OSVDEBIAN-CVE-2020-21528 5.5

A Segmentation Fault issue discovered in in ieee_segment function in outieee.c in nasm 2.14.03 and 2.15 allows remote attackers to cause a denial of service via crafted assembly file.

Record
DEBIAN-CVE-2020-21528
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVJLSEC-2026-200 5.5

A Segmentation Fault issue discovered in in ieee_segment function in outieee.c in nasm 2.14.03 and 2.15 allows remote attackers to cause a denial of service via crafted assembly file.

Record
JLSEC-2026-200
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVOESA-2023-1626 5.5

nasm security update

NASM is the Netwide Assembler, a free portable assembler for the Intel 80x86 microprocessor series, using primarily the traditional Intel instruction mnemonics and syntax. It also provides tools in RDOFF binary format, includes linker, library manager, loader, and information dump.

Security Fix(es):

A Segmentation Fault issue discovered in in ieee_segment function in outieee.c in nasm 2.14.03 and 2.15 allows remote attackers to cause a denial of service via crafted assembly file.(CVE-2020-21528)

Record
OESA-2023-1626
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2020-21528 5.5

A Segmentation Fault issue discovered in in ieee_segment function in outieee.c in nasm 2.14.03 and 2.15 allows remote attackers to cause a denial of service via crafted assembly file.

Record
UBUNTU-CVE-2020-21528
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
nasm
Alpaquita:23
 2.15.05-r1 up to 2.16.01-r0
2.16.01-r0
nasm
Alpaquita:stream
 2.15.05-r1 up to 2.16.01-r1
2.16.01-r1
nasm
Debian:12
 before 2.16.01-1
2.16.01-1
nasm
Debian:13
 before 2.16.01-1
2.16.01-1
nasm
Debian:14
 before 2.16.01-1
2.16.01-1
NASM_jll
Julia
 before 2.16.1+0
2.16.1+0
nasm
openEuler:20.03-LTS-SP1
 before 2.15.03-7.oe1
2.15.03-7.oe1
nasm
openEuler:20.03-LTS-SP3
 before 2.15.03-7.oe1
2.15.03-7.oe1
nasm
openEuler:22.03-LTS
 before 2.15.05-6.oe2203sp2
2.15.05-6.oe2203sp2
nasm
openEuler:22.03-LTS-SP1
 before 2.15.05-6.oe2203sp1
2.15.05-6.oe2203sp1
nasm
openEuler:22.03-LTS-SP2
 before 2.15.05-6.oe2203sp2
2.15.05-6.oe2203sp2
nasm
Ubuntu:20.04:LTS
 All versions, plus listed versions
2.14.02-1
 None known
nasm
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
2.15.05-12.15.05-1ubuntu0.1~esm12.15.05-1ubuntu0.1~esm2
 None known

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-21528 is a medium vulnerability (CVSS 5.5) in Nasm Netwide Assembler, published August 22, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.54%, the 45th percentile. Fixed in nasm 2.16.01-r0.

References

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