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NVD / CVE Program· CNA mitre

CVE-2020-27545: libdwarf before 20201017 has a one-byte out-of-bounds read because of an invalid pointer dereference via an invalid line table in a crafted…

MediumCVSS 6.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 26/100)

  • 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: 0.82% (FIRST EPSS); higher than 57.7% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: azl3 libdwarf 0.9.0-1 on Azure Linux 3.0 0.9.0-1; cbl2 libdwarf 0.9.0 on CBL Mariner 2.0 0.9.0.

Low priority for now. Upgrade to azl3 libdwarf 0.9.0-1 on Azure Linux 3.0 0.9.0-1; cbl2 libdwarf 0.9.0 on CBL Mariner 2.0 0.9.0 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

libdwarf before 20201017 has a one-byte out-of-bounds read because of an invalid pointer dereference via an invalid line table in a crafted object.

Published
Apr 15, 2023
Updated
Jun 16, 2026
EPSS
0.8% · 57th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.8%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2020-27545

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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
libdwarf projectlibdwarf

Affected versions

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

  • libdwarf project libdwarfbefore 2020-10-17

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12dwarfutilsbefore 20201201-120201201-1
openSUSE:Leap 15.4libdwarfbefore 20161124-150000.3.6.120161124-150000.3.6.1
SUSE:Linux Enterprise Module for Package Hub 15 SP4libdwarfbefore 20161124-150000.3.6.120161124-150000.3.6.1

Same product

libdwarf project: all records

Other highest-scoring records for the same primary product.

  • CVE-2017-9055An issue, also known as DW201703-001, was discovered in libdwarf 2017-03-21.
    40Plan
  • CVE-2017-9054An issue, also known as DW201703-002, was discovered in libdwarf 2017-03-21.
    40Plan
  • CVE-2017-9052An issue, also known as DW201703-006, was discovered in libdwarf 2017-03-21.
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2022-34299Jun 23, 2022 · There is a heap-based buffer over-read in libdwarf 0.4.0.
    32Monitor
  • ← EarlierCVE-2022-39170Sep 1, 2022 · libdwarf 0.4.1 has a double free in _dwarf_exec_frame_instr in dwarf_frame.c.
    35Monitor
  • Later →CVE-2020-28163Apr 15, 2023 · libdwarf before 20201201 allows a dwarf_print_lines.c NULL pointer dereference and application crash via a DWARF5 line-table header that…
    26Monitor

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
azl3 libdwarf 0.9.0-1 on Azure Linux 3.00.9.0-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 libdwarf 0.9.0 on CBL Mariner 2.00.9.0 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:dwarfutils20201201-1 · Debian:12Package registry (OSV)
opensuse:libdwarf20161124-150000.3.6.1 · openSUSE:Leap 15.4Package registry (OSV)
suse:libdwarf20161124-150000.3.6.1 · SUSE:Linux Enterprise Module for Package Hub 15 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.

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

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

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-763 · Release of Invalid Pointer or Reference

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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 (4 more)

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

All records