CVE-2019-11049: mail() may release string with refcount==1 twice
Vulnerability summary
CVE-2019-11049 is a critical (CVSS 9.8) Double Free vulnerability in debian debian_linux. EPSS estimates a 4.22% chance of exploitation in the next 30 days, higher than 91% of scored vulnerabilities.
Not severe (CVSS 6.5, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 1Timeline
- 23-12-2019PublishedVulnerability first disclosed.
- 16-09-2024Last modifiedVulnerability information updated.
Description
In PHP versions 7.3.x below 7.3.13 and 7.4.0 on Windows, when supplying custom headers to mail() function, due to mistake introduced in commit 78f4b4a2dcf92ddbccea1bb95f8390a18ac3342e, if the header is supplied in lowercase, this can result in double-freeing certain memory locations.
CVSS metrics
3 scores · 2 sources · 2 versions- CVE.orgCNA6.5MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:HDiffers
EPSS trend
Probability
4.22%
Chance of exploitation in the next 30 days
Percentile
91%
Versus all other CVEs
30-day change
No change 0.00 pp
From 4.22% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Debian1 product
- debian_linuxEOL10.0
Fedoraproject1 product
- fedoraEOL30 | 31
Php1 product
- phpEOL≥ 7.3.0, ≤ 7.3.13 | 7.4.0
Php group1 product
- php≥ 7.3.x, < 7.3.13 | ≥ 7.4.x, < 7.4.1
Tenable1 product
- security_center< 5.19.0
5 vendors · 5 products
