CVE-2020-14309: There's an issue with grub2 in all versions before 2.06 when handling squashfs filesystems containing a symbolic link with name length of…
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: 0.48% (FIRST EPSS).
- Someone with local access to the system can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: grub (Alpine:v3.17) 2.06-r0; grub2 (Debian:10) 2.02+dfsg1-20+deb10u1; grub2 (Debian:12) 2.04-9.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to grub (Alpine:v3.17) 2.06-r0; grub2 (Debian:10) 2.02+dfsg1-20+deb10u1; grub2 (Debian:12) 2.04-9 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
There's an issue with grub2 in all versions before 2.06 when handling squashfs filesystems containing a symbolic link with name length of UINT32 bytes in size. The name size leads to an arithmetic overflow leading to a zero-size allocation further causing a heap-based buffer overflow with attacker controlled data.
- BDU:2020-03968
- DSA-4735-1
- openSUSE-SU-2020:1168-1
- openSUSE-SU-2020:1169-1
- RHSA-2020:3216
- RHSA-2020:3217
- RHSA-2020:3223
- RHSA-2020:3227
- RHSA-2020:3271
- RHSA-2020:3273
- RHSA-2020:3274
- RHSA-2020:3275
- RHSA-2020:3276
- SUSE-SU-2020:14440-1
- SUSE-SU-2020:2073-1
- SUSE-SU-2020:2074-1
- SUSE-SU-2020:2076-1
- SUSE-SU-2020:2077-1
- SUSE-SU-2020:2078-1
- SUSE-SU-2020:2079-1
- Published
- Jul 30, 2020
- Updated
- Jun 16, 2026
- EPSS
- 0.4% · 42th percentile
- CWE
- CWE-190
Report tools
Action score
26
Low priority for now.
- CVSS
- 26 / 40 · 6.7 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.4%
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.
Is your version affected? Check itNoroxi 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.
We use this product, ask for helpAffected 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.
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.
n/a Grub
- All grub2 versions before 2.06affected
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- gnu grub2before 2.06
- opensuse leap15.1
- opensuse leap15.2
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.17 | grub | before 2.06-r0 | 2.06-r0 |
| Debian:10 | grub2 | before 2.02+dfsg1-20+deb10u1 | 2.02+dfsg1-20+deb10u1 |
| Debian:12 | grub2 | before 2.04-9 | 2.04-9 |
| openSUSE:Leap 15.1 | grub2 | before 2.02-lp151.21.21.4 | 2.02-lp151.21.21.4 |
| openSUSE:Leap 15.2 | grub2 | before 2.04-lp152.7.3.4 | 2.04-lp152.7.3.4 |
| Red Hat:enterprise_linux:7::client | fwupdate | before 0:12-6.el7_8 | 0:12-6.el7_8 |
| Red Hat:enterprise_linux:7::client | fwupdate-debuginfo | before 0:12-6.el7_8 | 0:12-6.el7_8 |
| Red Hat:enterprise_linux:7::client | fwupdate-devel | before 0:12-6.el7_8 | 0:12-6.el7_8 |
| Red Hat:enterprise_linux:7::client | fwupdate-efi | before 0:12-6.el7_8 | 0:12-6.el7_8 |
| Red Hat:enterprise_linux:7::client | fwupdate-libs | before 0:12-6.el7_8 | 0:12-6.el7_8 |
| Red Hat:enterprise_linux:7::client | grub2 | before 1:2.02-0.86.el7_8 | 1:2.02-0.86.el7_8 |
| Red Hat:enterprise_linux:7::client | grub2-common | before 1:2.02-0.86.el7_8 | 1:2.02-0.86.el7_8 |
| Red Hat:enterprise_linux:7::client | grub2-debuginfo | before 1:2.02-0.86.el7_8 | 1:2.02-0.86.el7_8 |
| Red Hat:enterprise_linux:7::client | grub2-efi-aa64-modules | before 1:2.02-0.86.el7_8 | 1:2.02-0.86.el7_8 |
| Red Hat:enterprise_linux:7::client | grub2-efi-ia32 | before 1:2.02-0.86.el7_8 | 1:2.02-0.86.el7_8 |
| Red Hat:enterprise_linux:7::client | grub2-efi-ia32-cdboot | before 1:2.02-0.86.el7_8 | 1:2.02-0.86.el7_8 |
| Red Hat:enterprise_linux:7::client | grub2-efi-ia32-modules | before 1:2.02-0.86.el7_8 | 1:2.02-0.86.el7_8 |
| Red Hat:enterprise_linux:7::client | grub2-efi-x64 | before 1:2.02-0.86.el7_8 | 1:2.02-0.86.el7_8 |
| Red Hat:enterprise_linux:7::client | grub2-efi-x64-cdboot | before 1:2.02-0.86.el7_8 | 1:2.02-0.86.el7_8 |
| Red Hat:enterprise_linux:7::client | grub2-efi-x64-modules | before 1:2.02-0.86.el7_8 | 1:2.02-0.86.el7_8 |
| Red Hat:enterprise_linux:7::client | grub2-pc | before 1:2.02-0.86.el7_8 | 1:2.02-0.86.el7_8 |
| Red Hat:enterprise_linux:7::client | grub2-pc-modules | before 1:2.02-0.86.el7_8 | 1:2.02-0.86.el7_8 |
| Red Hat:enterprise_linux:7::client | grub2-ppc-modules | before 1:2.02-0.86.el7_8 | 1:2.02-0.86.el7_8 |
| Red Hat:enterprise_linux:7::client | grub2-ppc64-modules | before 1:2.02-0.86.el7_8 | 1:2.02-0.86.el7_8 |
+96
Same product
gnu: all recordsOther highest-scoring records for the same primary product.
- CVE-2024-56737GNU GRUB (aka GRUB2) through 2.12 has a heap-based buffer overflow in fs/hfs.c via crafted sblock data in an HFS filesystem.35Monitor
- CVE-2022-2601A buffer overflow was found in grub_font_construct_glyph().34Monitor
- CVE-2020-10713A flaw was found in grub2, prior to version 2.06.33Monitor
Published before and after this one in the same product
- ← EarlierCVE-2020-15707Jul 29, 2020 · GRUB2 contained integer overflows when handling the initrd command, leading to a heap-based buffer overflow.25Monitor
- ← EarlierCVE-2020-14308Jul 29, 2020 · In grub2 versions before 2.06 the grub memory allocator doesn't check for possible arithmetic overflows on the requested allocation size.25Monitor
- Later →CVE-2020-14310Jul 31, 2020 · There is an issue on grub2 before version 2.06 at function read_section_as_string().24Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| alpine:grub | 2.06-r0 · Alpine:v3.17 | Package registry (OSV) |
| debian:grub2 | 2.04-9 · Debian:12 | Package registry (OSV) |
| opensuse:grub2 | 2.02-lp151.21.21.4 · openSUSE:Leap 15.1 | Package registry (OSV) |
| red hat:fwupd | 0:1.1.4-7.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:fwupd-debuginfo | 0:1.1.4-7.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:fwupd-debugsource | 0:1.1.4-7.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:grub2 | 1:2.02-87.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:grub2-common | 1:2.02-87.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:grub2-debuginfo | 1:2.02-87.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:grub2-debugsource | 1:2.02-87.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:grub2-efi-aa64 | 1:2.02-87.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:grub2-efi-aa64-cdboot | 1:2.02-87.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:grub2-efi-aa64-modules | 1:2.02-87.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:grub2-efi-ia32 | 1:2.02-87.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:grub2-efi-ia32-cdboot | 1:2.02-87.el8_2 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| suse:grub2 | 2.00-0.66.15.1 · SUSE:Linux Enterprise Server 11 SP4-LTSS | Package 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.
- TR-21-0964 · Dec 3, 2021(Hitachi Güvenlik Zafiyeti)
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.
- Administrator privileges are required.
- No user action is required.
- No special conditions are required; it is repeatable.
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
- Low
- Privileges required
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-190 · Integer Overflow or WraparoundCVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/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.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log (1)
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (5 more)Show less
Vendor advisories and official records. Exploit/PoC links are deliberately left out.