SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2013-0777

Use-after-free vulnerability in the nsDisplayBoxShadowOuter::Paint function in Mozilla Firefox before 19.0, Thunderbird before 17.0.3, and SeaMonkey before 2.16 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory…

HIGH 9.3EPSS 4.88%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (4.88%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

Use-after-free vulnerability in the nsDisplayBoxShadowOuter::Paint function in Mozilla Firefox before 19.0, Thunderbird before 17.0.3, and SeaMonkey before 2.16 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors.

CVSS 2.0
9.3 HIGHAV:N/AC:M/Au:N/C:C/I:C/A:C
EPSS
4.88% probability · 92th percentile
Public exploits
None in Exploit-DB
CISA KEV
Not listed
Weakness
CWE-416
Affected
mozilla/firefox · mozilla/seamonkey · mozilla/thunderbird · mozilla/thunderbird esr · opensuse/opensuse · canonical/ubuntu linux
Source
security@mozilla.org
EPSS trend
0%3%5%26 October 2026: 4.88%26 October 202626 October 2026

EPSS 4.9% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.