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NVD / CVE Program· CNA redhat

CVE-2020-1751: An out-of-bounds write vulnerability was found in glibc before 2.31 when handling signal trampolines on PowerPC.

HighCVSS 7.0 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 28/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.53% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: glibc (Debian:12) 2.30-3; glibc (openSUSE:Tumbleweed) 2.38-6.1; compat-libpthread-nonshared (Red Hat:enterprise_linux:8::appstream) 0:2.28-127.el8.
  • Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to glibc (Debian:12) 2.30-3; glibc (openSUSE:Tumbleweed) 2.38-6.1; compat-libpthread-nonshared (Red Hat:enterprise_linux:8::appstream) 0:2.28-127.el8 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

An out-of-bounds write vulnerability was found in glibc before 2.31 when handling signal trampolines on PowerPC. Specifically, the backtrace function did not properly check the array bounds when storing the frame address, resulting in a denial of service or potential code execution. The highest threat from this vulnerability is to system availability.

Published
Apr 17, 2020
Updated
Oct 14, 2026
EPSS
0.5% · 45th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CNA vs NVD score

NVD
7.0
CNA · redhat
5.1
1.9 point gap

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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  • when exploit code appears or is weaponized
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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
gnuglibc
redhatenterprise linux
canonicalubuntu linux

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat glibc

    • 2.31affected
Affected versions · NVD (5)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • canonical ubuntu linux16.04
  • canonical ubuntu linux18.04
  • canonical ubuntu linux19.10
  • gnu glibcbefore 2.31
  • redhat enterprise linux8.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12glibcbefore 2.30-32.30-3
openSUSE:Tumbleweedglibcbefore 2.38-6.12.38-6.1
Red Hat:enterprise_linux:8::appstreamcompat-libpthread-nonsharedbefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::appstreamglibc-debuginfobefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::appstreamglibc-debuginfo-commonbefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::appstreamglibc-utilsbefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::baseosglibcbefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::baseosglibc-all-langpacksbefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::baseosglibc-commonbefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::baseosglibc-develbefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::baseosglibc-headersbefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::baseosglibc-langpack-aabefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::baseosglibc-langpack-afbefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::baseosglibc-langpack-agrbefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::baseosglibc-langpack-akbefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::baseosglibc-langpack-ambefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::baseosglibc-langpack-anbefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::baseosglibc-langpack-anpbefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::baseosglibc-langpack-arbefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::baseosglibc-langpack-asbefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::baseosglibc-langpack-astbefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::baseosglibc-langpack-aycbefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::baseosglibc-langpack-azbefore 0:2.28-127.el80:2.28-127.el8
Red Hat:enterprise_linux:8::baseosglibc-langpack-bebefore 0:2.28-127.el80:2.28-127.el8

+96

Same product

gnu: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-4911Glibc: buffer overflow in ld.so leading to privilege escalationKEV
    80Now
  • CVE-2015-0235Heap-based buffer overflow in the __nss_hostname_digits_dots function in glibc 2.2, and other 2.x versions before 2.18, allows…
    68This week
  • CVE-2015-7547Multiple stack-based buffer overflows in the (1) send_dg and (2) send_vc functions in the libresolv library in the GNU C Library (aka glibc…
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Published before and after this one in the same product

  • ← EarlierCVE-2020-10029Mar 4, 2020 · The GNU C Library (aka glibc or libc6) before 2.32 could overflow an on-stack buffer during range reduction if an input to an 80-bit long…
    22Monitor
  • ← EarlierCVE-2020-6096Apr 1, 2020 · An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc 2.30.9000.
    34Monitor
  • Later →CVE-2020-1752Apr 30, 2020 · A use-after-free vulnerability introduced in glibc upstream version 2.14 was found in the way the tilde expansion was carried out.
    28Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:glibc2.30-3 · Debian:12Package registry (OSV)
opensuse:glibc2.38-6.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:compat-libpthread-nonshared0:2.28-127.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:glibc0:2.28-127.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:glibc-all-langpacks0:2.28-127.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:glibc-common0:2.28-127.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:glibc-debuginfo0:2.28-127.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:glibc-debuginfo-common0:2.28-127.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:glibc-devel0:2.28-127.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:glibc-headers0:2.28-127.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:glibc-langpack-aa0:2.28-127.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:glibc-langpack-af0:2.28-127.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:glibc-langpack-agr0:2.28-127.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:glibc-utils0:2.28-127.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
suse:glibc2.22-100.21.5 · SUSE:Linux Enterprise Software Development Kit 12 SP4Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records