CVE-2021-22191: Improper URL handling in Wireshark 3.4.0 to 3.4.3 and 3.2.0 to 3.2.11 could allow remote code execution via via packet injection or crafted
Noroxi assessment
Priority: Monitor (action score 36/100)
- 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: 3.6% (FIRST EPSS); higher than 89.5% 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: wireshark (Debian:12) 3.4.4-1; wireshark (Debian:9) 2.6.20-0+deb9u3; wireshark (openSUSE:Leap 15.2) 3.4.5-lp152.2.12.1.
- Severity is disputed: the assigning authority (CNA) scores it 6.3, NVD 8.8.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to wireshark (Debian:12) 3.4.4-1; wireshark (Debian:9) 2.6.20-0+deb9u3; wireshark (openSUSE:Leap 15.2) 3.4.5-lp152.2.12.1 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
Improper URL handling in Wireshark 3.4.0 to 3.4.3 and 3.2.0 to 3.2.11 could allow remote code execution via via packet injection or crafted capture file.
- Published
- Mar 15, 2021
- Updated
- Jun 16, 2026
- EPSS
- 3.6% · 89th percentile
- CWE
- CWE-74
Report tools
Action score
36
Monitor
Low priority for now.
- CVSS
- 35 / 40 · 8.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 3.6%
CNA vs NVD score
- NVD
- 8.8
- CNA · GitLab
- 6.3
- 2.5 point gap
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
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.
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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.
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 |
|---|---|---|
| wireshark | wireshark | cpe:2.3:a:wireshark:wireshark |
| oracle | zfs storage appliance | cpe:2.3:o:oracle:zfs_storage_appliance |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux9.0
- oracle zfs storage appliance8.8
- wireshark wireshark3.2.0 and later · up to 3.2.11 inclusive
- wireshark wireshark3.4.0 and later · up to 3.4.3 inclusive
Versions reported by the vendor
Affected version ranges reported by the assigning authority (GitLab). Independent of NVD's CPE analysis and usually ahead of it.
The Wireshark Foundation Wireshark
- >=3.4.0, <3.4.4, >=3.2.0, <3.2.12affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | wireshark | before 3.4.4-1 | 3.4.4-1 |
| Debian:9 | wireshark | before 2.6.20-0+deb9u3 | 2.6.20-0+deb9u3 |
| openSUSE:Leap 15.2 | wireshark | before 3.4.5-lp152.2.12.1 | 3.4.5-lp152.2.12.1 |
| openSUSE:Leap 15.3 | sbc | before 1.3-3.2.1 | 1.3-3.2.1 |
| openSUSE:Leap 15.3 | wireshark | before 3.4.5-3.53.1 | 3.4.5-3.53.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS | libqt5-qtmultimedia | before 5.9.7-7.2.1 | 5.9.7-7.2.1 |
| SUSE:Linux Enterprise High Performance Computing 15-ESPOS | libvirt | before 4.0.0-9.37.21 | 4.0.0-9.37.21 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP2 | sbc | before 1.3-3.2.1 | 1.3-3.2.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP2 | wireshark | before 3.4.5-3.53.1 | 3.4.5-3.53.1 |
Same product
wireshark: all recordsOther highest-scoring records for the same primary product.
- CVE-2010-0304Multiple buffer overflows in the LWRES dissector in Wireshark 0.9.15 through 1.0.10 and 1.2.0 through 1.2.5 allow remote attackers to cause 52Plan
- CVE-2014-2299Buffer overflow in the mpeg_read function in wiretap/mpeg.c in the MPEG parser in Wireshark 1.8.x before 1.8.13 and 1.10.x before 1.10.6 all51Plan
- CVE-2011-1591Stack-based buffer overflow in the DECT dissector in epan/dissectors/packet-dect.c in Wireshark 1.4.x before 1.4.5 allows remote attackers t50Plan
Published before and after this one in the same product
- ← EarlierCVE-2021-22173Feb 17, 2021 · Memory leak in USB HID dissector in Wireshark 3.4.0 to 3.4.2 allows denial of service via packet injection or crafted capture file31Monitor
- ← EarlierCVE-2021-22174Feb 17, 2021 · Crash in USB HID dissector in Wireshark 3.4.0 to 3.4.2 allows denial of service via packet injection or crafted capture file31Monitor
- Later →CVE-2021-22207Apr 23, 2021 · Excessive memory consumption in MS-WSP dissector in Wireshark 3.4.0 to 3.4.4 and 3.2.0 to 3.2.12 allows denial of service via packet injecti27Monitor
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:wireshark | 3.4.4-1 · Debian:12 | Package registry (OSV) |
| opensuse:sbc | 1.3-3.2.1 · openSUSE:Leap 15.3 | Package registry (OSV) |
| opensuse:wireshark | 3.4.5-lp152.2.12.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| suse:libqt5-qtmultimedia | 5.9.7-7.2.1 · SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS | Package registry (OSV) |
| suse:libvirt | 4.0.0-9.37.21 · SUSE:Linux Enterprise High Performance Computing 15-ESPOS | Package registry (OSV) |
| suse:sbc | 1.3-3.2.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP2 | Package registry (OSV) |
| suse:wireshark | 3.4.5-3.53.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP2 | 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.
No history yet (it accumulates with the daily EPSS job).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Lukas EulerPositive Security
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-21-0331 · Apr 21, 2021(Oracle Güvenlik Uyarısı Yayınladı)
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
- high · data can be read
- 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
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-74 · Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- HTTP Request SplittingCAPEC-105likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
- Format String InjectionCAPEC-135likelihood: High · High
- Client-side Injection-induced Buffer OverflowCAPEC-14likelihood: Medium · High
Change log
- Fix✗ → ✓
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References
Show all references (5 more)Show less
Vendor advisories and official records. Exploit/PoC links are deliberately left out.