CVE-2025-8027
published 2025-07-22CVE-2025-8027: On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. This…
PriorityP429medium6.5CVSS 3.1
AVNACLPRNUIRSUCHINAN
EPSS
0.35%
27.4th percentile
On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.
Affected
15 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | firefox | < firefox 141.0-1 (sid) | firefox 141.0-1 (sid) |
| debian | firefox-esr | < firefox 141.0-1 (sid) | firefox 141.0-1 (sid) |
| debian | thunderbird | < firefox 141.0-1 (sid) | firefox 141.0-1 (sid) |
| mozilla | firefox | < 115.26.0 | 115.26.0 |
| mozilla | firefox | < 141.0 | 141.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 128.0 < 128.13.0 | 128.13.0 |
| mozilla | firefox | >= 140.0 < 140.1.0 | 140.1.0 |
| mozilla | thunderbird | < 128.13.0 | 128.13.0 |
| mozilla | thunderbird | < 141.0 | 141.0 |
| mozilla | thunderbird | >= 0 < 1:128.13.0esr-1~deb11u1 | 1:128.13.0esr-1~deb11u1 |
| mozilla | thunderbird | >= 0 < 1:128.13.0esr-1~deb12u1 | 1:128.13.0esr-1~deb12u1 |
| mozilla | thunderbird | >= 0 < 1:128.13.0esr-1 | 1:128.13.0esr-1 |
| mozilla | thunderbird | >= 0 < 1:128.13.0esr-1 | 1:128.13.0esr-1 |
| mozilla | thunderbird | >= 140.0 < 140.1.0 | 140.1.0 |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
osv6.5MEDIUM
vendor_debian6.5MEDIUM
vendor_redhat6.5MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Ubuntu
Thunderbird vulnerabilities
vendor_ubuntu·2026-02-02
CVE-2025-8031 Thunderbird vulnerabilities
Title: Thunderbird vulnerabilities
Summary: Several security issues were fixed in Thunderbird.
Multiple security issues were discovered in Thunderbird. If a user were
tricked into opening a specially crafted website in a browsing context,
an attacker could potentially exploit these to cause a denial of service,
obtain sensitive information, bypass security restrictions, cross-site
tracing, or execute arbitrary code.
Instructions: In general, a standard system update will make all the necessary changes.
Red Hat
firefox: thunderbird: JavaScript engine only wrote partial return value to stack
vendor_redhat·2025-07-22·CVSS 6.5
CVE-2025-8027 [MEDIUM] CWE-457 firefox: thunderbird: JavaScript engine only wrote partial return value to stack
firefox: thunderbird: JavaScript engine only wrote partial return value to stack
On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. This vulnerability affects Firefox < 141, Firefox ESR < 115.26, Firefox ESR < 128.13, Firefox ESR < 140.1, Thunderbird < 141, Thunderbird < 128.13, and Thunderbird < 140.1.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
On 64-bit platforms, IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, reads the entire 64 bits.
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Debian
CVE-2025-8027: firefox - On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value ...
vendor_debian·2025·CVSS 6.5
CVE-2025-8027 [MEDIUM] CVE-2025-8027: firefox - On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value ...
On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. This vulnerability affects Firefox < 141, Firefox ESR < 115.26, Firefox ESR < 128.13, Firefox ESR < 140.1, Thunderbird < 141, Thunderbird < 128.13, and Thunderbird < 140.1.
Scope: local
sid: resolved (fixed in 141.0-1)
Mozilla
Mozilla Foundation Security Advisory 2025-56: CVE-2025-8027
vendor_mozilla·CVSS 6.5
CVE-2025-8027 [MEDIUM] Mozilla Foundation Security Advisory 2025-56: CVE-2025-8027
Mozilla Foundation Security Advisory 2025-56
CVE: CVE-2025-8027
Product: Firefox
Impact: high
Fixed in: Firefox 141
Mozilla
Mozilla Foundation Security Advisory 2025-62: CVE-2025-8027
vendor_mozilla·CVSS 6.5
CVE-2025-8027 [MEDIUM] Mozilla Foundation Security Advisory 2025-62: CVE-2025-8027
Mozilla Foundation Security Advisory 2025-62
CVE: CVE-2025-8027
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 128.13
Mozilla
Mozilla Foundation Security Advisory 2025-58: CVE-2025-8027
vendor_mozilla·CVSS 6.5
CVE-2025-8027 [MEDIUM] Mozilla Foundation Security Advisory 2025-58: CVE-2025-8027
Mozilla Foundation Security Advisory 2025-58
CVE: CVE-2025-8027
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 128.13
Mozilla
Mozilla Foundation Security Advisory 2025-63: CVE-2025-8027
vendor_mozilla·CVSS 6.5
CVE-2025-8027 [MEDIUM] Mozilla Foundation Security Advisory 2025-63: CVE-2025-8027
Mozilla Foundation Security Advisory 2025-63
CVE: CVE-2025-8027
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.1
Mozilla
Mozilla Foundation Security Advisory 2025-59: CVE-2025-8027
vendor_mozilla·CVSS 6.5
CVE-2025-8027 [MEDIUM] Mozilla Foundation Security Advisory 2025-59: CVE-2025-8027
Mozilla Foundation Security Advisory 2025-59
CVE: CVE-2025-8027
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.1
Mozilla
Mozilla Foundation Security Advisory 2025-57: CVE-2025-8027
vendor_mozilla·CVSS 6.5
CVE-2025-8027 [MEDIUM] Mozilla Foundation Security Advisory 2025-57: CVE-2025-8027
Mozilla Foundation Security Advisory 2025-57
CVE: CVE-2025-8027
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 115.26
Mozilla
Mozilla Foundation Security Advisory 2025-61: CVE-2025-8027
vendor_mozilla·CVSS 6.5
CVE-2025-8027 [MEDIUM] Mozilla Foundation Security Advisory 2025-61: CVE-2025-8027
Mozilla Foundation Security Advisory 2025-61
CVE: CVE-2025-8027
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 141
OSV
CVE-2025-8027: On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack
osv·2025-07-22·CVSS 6.5
CVE-2025-8027 [MEDIUM] CVE-2025-8027: On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack
On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. This vulnerability affects Firefox < 141, Firefox ESR < 115.26, Firefox ESR < 128.13, Firefox ESR < 140.1, Thunderbird < 141, Thunderbird < 128.13, and Thunderbird < 140.1.
GHSA
GHSA-j3rx-39f7-r8hw: On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack
ghsa_unreviewed·2025-07-22
CVE-2025-8027 [MEDIUM] CWE-457 GHSA-j3rx-39f7-r8hw: On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack
On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. This vulnerability affects Firefox < 141, Firefox ESR < 115.26, Firefox ESR < 128.13, Firefox ESR < 140.1, Thunderbird < 141, Thunderbird < 128.13, and Thunderbird < 140.1.
No detection rules found.
No public exploits indexed.
https://bugzilla.mozilla.org/show_bug.cgi?id=1968423https://www.mozilla.org/security/advisories/mfsa2025-56/https://www.mozilla.org/security/advisories/mfsa2025-57/https://www.mozilla.org/security/advisories/mfsa2025-58/https://www.mozilla.org/security/advisories/mfsa2025-59/https://www.mozilla.org/security/advisories/mfsa2025-61/https://www.mozilla.org/security/advisories/mfsa2025-62/https://www.mozilla.org/security/advisories/mfsa2025-63/https://lists.debian.org/debian-lts-announce/2025/07/msg00016.html
2025-07-22
Published