Denial of service due to integer overflow in loop counter
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-835.
Summary
Exiv2 is a command-line utility and C++ library for reading, writing, deleting, and modifying the metadata of image files. An infinite loop is triggered when Exiv2 is used to read the metadata of a crafted image file. An attacker could potentially exploit the vulnerability to cause a denial of service, if they can trick the victim into running Exiv2 on a crafted image file. The bug is fixed in version v0.27.5.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Exiv2 | exiv2 | up to 0.27.4 | — | No fix listed | CNA |
- exiv2 VendorExiv2 Affected up to 0.27.4 Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:exiv2:exiv2:*:*:*:*:*:*:*:* | up to 0.27.4 | Vulnerable | Exiv2 |
| cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* | 33 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* | 34 | Vulnerable | Fedoraproject |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
- cpe:2.3:a:exiv2:exiv2:*:*:*:*:*:*:*:* Versions up to 0.27.4 Vulnerable ·Exiv2
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
Timeline
- 2026-10-02 Threatist record created from CVE-2021-34334
References
More Exiv2 vulnerabilities
- TI-2020-13478 Buffer Overflow vulnerability in tEXtToDataBuf function in pngimage.cpp in Exiv2 0.27.1… CVSS 3.1HIGH 7.8
- TI-2025-19560 Use After Free in Exiv2 CVSS 4.0MEDIUM 5.3
- TI-2020-13491 An uncontrolled memory allocation in DataBufdata(subBox.length-sizeof(box)) function of… CVSS 3.1MEDIUM 6.5
- TI-2018-08245 Exiv2 0.26 has a heap-based buffer overflow in getData in preview.cpp. CVSS 3.0CRITICAL 9.8
- TI-2025-33923 Exiv2 Segmentation Faults in Exiv2::EpsImage::writeMetadata() via crafted EPS file CVSS 4.0LOW 1.8
- TI-2019-06608 An issue was discovered in Exiv2 0.27. CVSS 3.0HIGH 8.8
Sources
- CVE-2021-34334 · CVE Program
- CVE-2021-34334 · NVD
- FIRST EPSS
- CVE-2021-34334 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences