CVE-2025-5268

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.49% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 39.9% of scored records. A rank, not a probability.

NVD base score

8.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2025-05-27 12:29Z1 YR AGO

Last updated

2026-04-13 14:29Z4 MO AGO

Reserved

2025-05-27

Assigning CNA

mozilla

Record state

PUBLISHED

Severity

High (CVSS 8.1)

CNA CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass

Data version

5.2

Document digest

d824b831b9f873b4228a41c0cff60434a77b672251c6c00c8217552a03b1160a

• bugzilla.mozilla.orgMemory safety bugs fixed in Firefox 139, Thunderbird 139, Firefox ESR 128.11, and Thunderbird 128.11https://bugzilla.mozilla.org/buglist.cgi?bug_id=1950136%2C1958121%2C1960499%2C1962634
• www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2025-42/
• www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2025-44/
• www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2025-45/
• www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2025-46/
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/05/msg00046.html
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/05/msg00043.html