Buffer overflow in the FileReadGIF function in tkImgGIF.c for Tk Toolkit 8.4.12 and earlier, and 8.3.5 and earlier, allows user-assisted attackers to cause a denial of service (segmentation fault) via an animated GIF in which the first subimage is smaller than a subsequent subimage, which triggers the overflow in the ReadImage function, a different vulnerability than CVE-2007-5137.
Conclusion & alert: CVE-2007-5378 is rated Moderate Risk (44.8/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.36%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2025-04-26 | 1.47% | 1.36% | -0.11% |
| 2 | 2025-03-30 | 3.80% | 1.47% | -2.33% |
| 3 | 2025-03-29 | — | 3.80% | — |
Full EPSS history (13 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 4.3 | 2.0 | MEDIUM |
|
8.6 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
medium | CVE-2007-5378 medium priority: Debian including 1 source packages (libtk-img), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2007-5378 |
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2007-5378 |
ubuntu
|
low | CVE-2007-5378 low priority: Ubuntu including 3 source packages (libtk-img, tk8.3, tk8.4), 37 status rows across 13 suites (dapper, edgy, feisty, gutsy, hardy, intrepid, jaunty, karmic, lucid, maverick, natty, oneiric, upstream): not-affected 21, released 12, ignored 3, DNE 1. | https://ubuntu.com/security/CVE-2007-5378 |
Red Hat is aware of this issue and is tracking it via the following bug: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=CVE-2007-5378 The Red Hat Security Response Team has rated this issue as having low security impact, a future update may address this flaw.
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| tcl_tk | tk_toolkit | <= 8.3.5 | cpe:2.3:a:tcl_tk:tk_toolkit:*:*:*:*:*:*:*:* |
| tcl_tk | tk_toolkit | <= 8.4.12 | cpe:2.3:a:tcl_tk:tk_toolkit:*:*:*:*:*:*:*:* |