CVE-2017-9049

Exp

libxml2 20904-GITv2.9.4-16-g0741801 is vulnerable to a heap-based buffer over-read in the xmlDictComputeFastKey function in dict.c. This vulnerability causes programs that use libxml2, such as PHP, to crash. This vulnerability exists because of an incomplete fix for libxml2 Bug 759398.

Published: 2017-05-18 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-9049 is rated High Exploit Risk (80.8/100): CVSS High severity, with high exploitation likelihood (EPSS 4.63%, 90th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +4.16% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2017-9049

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2017-9049

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 2026-06-15 0.47% 4.63% +4.16%
2 2025-12-24 0.39% 0.47% +0.08%
3 2025-12-19 — 0.39% —

Full EPSS history (24 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-9049

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2017-9049

OS Trackers for CVE-2017-9049

vendor priority summary link
alpine — CVE-2017-9049: 1 source package rows (libxml2); 15 state rows across 5 repos (3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 0, open 15. https://security.alpinelinux.org/vuln/CVE-2017-9049
debian not yet assigned CVE-2017-9049 not yet assigned priority: Debian including 1 source packages (libxml2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-9049
gentoo normal CVE-2017-9049: 1 GLSA(s) (201711-01), 1 atom(s) (dev-libs/libxml2); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2017-9049
redhat medium — https://access.redhat.com/security/cve/CVE-2017-9049
suse high CVE-2017-9049 severity important: SUSE including 364 source package names (0.9.1:libxml2-2-2.9.4-39.2, 1.0.0:libxml2-2-2.9.4-39.2, …), 513 product×package rows across 102 product lines (Container caasp/v4/default-http-backend, Container caasp/v4/dnsmasq-nanny, … (102 product lines)): Fixed 310, Known Affected 157, Known Not Affected 46. https://www.suse.com/security/cve/CVE-2017-9049/
ubuntu medium CVE-2017-9049 medium priority: Ubuntu including 1 source packages (libxml2), 5 status rows across 5 suites (trusty, upstream, xenial, yakkety, zesty): released 4, ignored 1. https://ubuntu.com/security/CVE-2017-9049

Affected software / configurations for CVE-2017-9049

Vendor Product Version Raw CPE
xmlsoft libxml2 2.9.4 cpe:2.3:a:xmlsoft:libxml2:2.9.4:*:*:*:*:*:*:*

References for CVE-2017-9049

cvelogic Threat Intelligence