CVE-2021-26221: The ezxml_new function in ezXML 0.8.6 and earlier is vulnerable to OOB write when opening XML file after exhausting the memory pool.
Noroxi assessment
Priority: Monitor (action score 32/100)
- 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: 1.1% (FIRST EPSS); higher than 68.3% 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: netcdf (Debian:12) 1:4.9.0-1; netcdf-parallel (Debian:12) 1:4.9.0-1; scilab (Debian:14) 2024.1.0+dfsg1-1.
Low priority for now. Upgrade to netcdf (Debian:12) 1:4.9.0-1; netcdf-parallel (Debian:12) 1:4.9.0-1; scilab (Debian:14) 2024.1.0+dfsg1-1 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
- Published
- Feb 8, 2021
- Updated
- Jun 16, 2026
- EPSS
- 1.1% · 68th percentile
- CWE
- CWE-787
Report tools
Action score
32
Low priority for now.
- CVSS
- 32 / 40 · 8.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 1.1%
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.
| Vendor | Product | CPE |
|---|---|---|
| ezxml project | ezxml | cpe:2.3:a:ezxml_project:ezxml |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- ezxml project ezxmlup to 0.8.6 inclusive
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | mapcache | from 0 | — |
| Debian:12 | netcdf | before 1:4.9.0-1 | 1:4.9.0-1 |
| Debian:12 | netcdf-parallel | before 1:4.9.0-1 | 1:4.9.0-1 |
| Debian:12 | scilab | from 0 | — |
| Debian:14 | scilab | before 2024.1.0+dfsg1-1 | 2024.1.0+dfsg1-1 |
| openSUSE:Leap 15.2 | netcdf_4_7_3-gnu-hpc | before 4.7.3-lp152.2.6.1 | 4.7.3-lp152.2.6.1 |
| openSUSE:Leap 15.2 | netcdf_4_7_3-gnu-mpich-hpc | before 4.7.3-lp152.2.6.1 | 4.7.3-lp152.2.6.1 |
| openSUSE:Leap 15.2 | netcdf_4_7_3-gnu-mvapich2-hpc | before 4.7.3-lp152.2.6.1 | 4.7.3-lp152.2.6.1 |
| openSUSE:Leap 15.2 | netcdf_4_7_3-gnu-openmpi2-hpc | before 4.7.3-lp152.2.6.1 | 4.7.3-lp152.2.6.1 |
| openSUSE:Leap 15.2 | netcdf_4_7_3-gnu-openmpi3-hpc | before 4.7.3-lp152.2.6.1 | 4.7.3-lp152.2.6.1 |
| openSUSE:Leap 15.3 | netcdf | before 4.6.1-5.7.1 | 4.6.1-5.7.1 |
| openSUSE:Leap 15.3 | netcdf | before 4.7.4-4.3.2 | 4.7.4-4.3.2 |
| openSUSE:Leap 15.3 | netcdf_4_6_1-gnu-hpc | before 4.6.1-10.7.2 | 4.6.1-10.7.2 |
| openSUSE:Leap 15.3 | netcdf_4_6_1-gnu-mpich-hpc | before 4.6.1-10.7.2 | 4.6.1-10.7.2 |
| openSUSE:Leap 15.3 | netcdf_4_6_1-gnu-mvapich2-hpc | before 4.6.1-10.7.2 | 4.6.1-10.7.2 |
| openSUSE:Leap 15.3 | netcdf_4_6_1-gnu-openmpi1-hpc | before 4.6.1-10.7.2 | 4.6.1-10.7.2 |
| openSUSE:Leap 15.3 | netcdf_4_6_1-gnu-openmpi2-hpc | before 4.6.1-10.7.2 | 4.6.1-10.7.2 |
| openSUSE:Leap 15.3 | netcdf_4_7_3-gnu-hpc | before 4.7.3-3.7.2 | 4.7.3-3.7.2 |
| openSUSE:Leap 15.3 | netcdf_4_7_3-gnu-mpich-hpc | before 4.7.3-3.7.2 | 4.7.3-3.7.2 |
| openSUSE:Leap 15.3 | netcdf_4_7_3-gnu-mvapich2-hpc | before 4.7.3-3.7.2 | 4.7.3-3.7.2 |
| openSUSE:Leap 15.3 | netcdf_4_7_3-gnu-openmpi2-hpc | before 4.7.3-3.7.2 | 4.7.3-3.7.2 |
| openSUSE:Leap 15.3 | netcdf_4_7_3-gnu-openmpi3-hpc | before 4.7.3-3.7.2 | 4.7.3-3.7.2 |
| openSUSE:Leap 15.3 | netcdf_4_7_4-gnu-hpc | before 4.7.4-4.3.2 | 4.7.4-4.3.2 |
| openSUSE:Leap 15.3 | netcdf_4_7_4-gnu-mpich-hpc | before 4.7.4-4.3.2 | 4.7.4-4.3.2 |
+26
Same product
ezxml project: all recordsOther highest-scoring records for the same primary product.
- CVE-2021-26222The ezxml_new function in ezXML 0.8.6 and earlier is vulnerable to OOB write when opening XML file after exhausting the memory pool.32Monitor
- CVE-2021-26220The ezxml_toxml function in ezxml 0.8.6 and earlier is vulnerable to OOB write when opening XML file after exhausting the memory pool.32Monitor
- CVE-2021-31598An issue was discovered in libezxml.a in ezXML 0.8.6.30Monitor
Published before and after this one in the same product
- ← EarlierCVE-2019-20201Dec 31, 2019 · An issue was discovered in ezXML 0.8.3 through 0.8.6.26Monitor
- ← EarlierCVE-2019-20202Dec 31, 2019 · An issue was discovered in ezXML 0.8.3 through 0.8.6.26Monitor
- Later →CVE-2021-30485Apr 11, 2021 · An issue was discovered in libezxml.a in ezXML 0.8.6.26Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:netcdf | 1:4.9.0-1 · Debian:12 | Package registry (OSV) |
| debian:netcdf-parallel | 1:4.9.0-1 · Debian:12 | Package registry (OSV) |
| debian:scilab | 2024.1.0+dfsg1-1 · Debian:14 | Package registry (OSV) |
| opensuse:netcdf | 4.6.1-5.7.1 · openSUSE:Leap 15.3 | Package registry (OSV) |
| opensuse:netcdf_4_6_1-gnu-hpc | 4.6.1-10.7.2 · openSUSE:Leap 15.3 | Package registry (OSV) |
| opensuse:netcdf_4_6_1-gnu-mpich-hpc | 4.6.1-10.7.2 · openSUSE:Leap 15.3 | Package registry (OSV) |
| opensuse:netcdf_4_6_1-gnu-mvapich2-hpc | 4.6.1-10.7.2 · openSUSE:Leap 15.3 | Package registry (OSV) |
| opensuse:netcdf_4_6_1-gnu-openmpi1-hpc | 4.6.1-10.7.2 · openSUSE:Leap 15.3 | Package registry (OSV) |
| opensuse:netcdf_4_6_1-gnu-openmpi2-hpc | 4.6.1-10.7.2 · openSUSE:Leap 15.3 | Package registry (OSV) |
| opensuse:netcdf_4_7_3-gnu-hpc | 4.7.3-lp152.2.6.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:netcdf_4_7_3-gnu-mpich-hpc | 4.7.3-lp152.2.6.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:netcdf_4_7_3-gnu-mvapich2-hpc | 4.7.3-lp152.2.6.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:netcdf_4_7_3-gnu-openmpi2-hpc | 4.7.3-lp152.2.6.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:netcdf_4_7_3-gnu-openmpi3-hpc | 4.7.3-lp152.2.6.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| opensuse:netcdf-openmpi | 4.6.1-5.7.1 · openSUSE:Leap 15.3 | Package registry (OSV) |
| suse:netcdf_4_6_1-gnu-hpc | 4.6.1-5.7.1 · SUSE:Linux Enterprise High Performance Computing 15-ESPOS | Package registry (OSV) |
| suse:netcdf_4_6_1-gnu-mpich-hpc | 4.6.1-5.7.1 · SUSE:Linux Enterprise High Performance Computing 15-ESPOS | Package registry (OSV) |
| suse:netcdf_4_6_1-gnu-mvapich2-hpc | 4.6.1-5.7.1 · SUSE:Linux Enterprise High Performance Computing 15-ESPOS | Package registry (OSV) |
| suse:netcdf_4_6_1-gnu-openmpi2-hpc | 4.6.1-5.7.1 · SUSE:Linux Enterprise High Performance Computing 15-ESPOS | Package registry (OSV) |
| suse:netcdf_4_7_3-gnu-hpc | 4.7.3-3.7.2 · SUSE:Linux Enterprise Module for HPC 15 SP2 | Package registry (OSV) |
| suse:netcdf_4_7_3-gnu-mpich-hpc | 4.7.3-3.7.2 · SUSE:Linux Enterprise Module for HPC 15 SP2 | Package registry (OSV) |
| suse:netcdf_4_7_3-gnu-mvapich2-hpc | 4.7.3-3.7.2 · SUSE:Linux Enterprise Module for HPC 15 SP2 | Package registry (OSV) |
| suse:netcdf_4_7_3-gnu-openmpi2-hpc | 4.7.3-3.7.2 · SUSE:Linux Enterprise Module for HPC 15 SP2 | Package registry (OSV) |
| suse:netcdf_4_7_3-gnu-openmpi3-hpc | 4.7.3-3.7.2 · SUSE:Linux Enterprise Module for HPC 15 SP2 | Package registry (OSV) |
| suse:netcdf_4_7_4-gnu-hpc | 4.7.4-4.3.2 · SUSE:Linux Enterprise Module for HPC 15 SP3 | Package registry (OSV) |
| suse:netcdf_4_7_4-gnu-mpich-hpc | 4.7.4-4.3.2 · SUSE:Linux Enterprise Module for HPC 15 SP3 | Package registry (OSV) |
| suse:netcdf_4_7_4-gnu-mvapich2-hpc | 4.7.4-4.3.2 · SUSE:Linux Enterprise Module for HPC 15 SP3 | 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.
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
- 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
- high · data or configuration can be modified
- 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
- High
- Availability impact
- High
Weakness class (CWE)
CWE-787 · Out-of-bounds WriteCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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.
Change log (1)
- Fix✗ → ✓
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