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CVE-2007-4990

23
FAUCET Score

CVE-2007-4990 describes a heap corruption vulnerability in the X.Org X Font Server (xfs) before version 1.0.5. This flaw, residing in the swap_char2b function, allows unauthenticated attackers to execute arbitrary code by sending specially crafted QueryXBitmaps or QueryXExtents protocol requests with malicious size values. With a CVSS score of 7.5, this vulnerability is considered high severity due to its network-based attack vector, low attack complexity, and potential for complete compromise of confidentiality, integrity, and availability. Despite its severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.0.4CPE matchmatch criteria
cpe:2.3:a:x.org:x_font_server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.5HIGH

AV:N/AC:L/Au:N/C:P/I:P/A:P

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
10.74%
Probability of exploitation in next 30 days
EPSS Percentile
95.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.1074 is in the 93rd percentile among its peer group of 51,506 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 2.1Fixed in: XFree86-0:4.1.0-86.EL
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 3Fixed in: XFree86-0:4.3.0-126.EL
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: xorg-x11-0:6.8.2-1.EL.33.0.2
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: xorg-x11-xfs

Vendor Advisories (1)

redhatCVE-2007-4990Low

xfs heap overflow in the swap_char2b function

Oct 2, 2007

References

bugs.freedesktop.org / show_bug.cgi
bugs.gentoo.org / show_bug.cgi
docs.info.apple.com / article.html
h20000.www2.hp.com / bizsupport/TechSupport/Document.jsp
labs.idefense.com / intelligence/vulnerabilities/display.php
lists.apple.com / archives/security-announce/2008/Mar/msg00001.html
lists.freedesktop.org / archives/xorg-announce/2007-October/000416.html
secunia.com / advisories/27040
secunia.com / advisories/27052
secunia.com / advisories/27060
secunia.com / advisories/27176
secunia.com / advisories/27228
secunia.com / advisories/27240
secunia.com / advisories/27560
secunia.com / advisories/28004
secunia.com / advisories/28514
secunia.com / advisories/28536
secunia.com / advisories/28542
secunia.com / advisories/29420
security.gentoo.org / glsa/glsa-200710-11.xml
exchange.xforce.ibmcloud.com / vulnerabilities/36920
issues.rpath.com / browse/RPL-1756
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11599
sunsolve.sun.com / search/document.do
sunsolve.sun.com / search/document.do
redhat.com / archives/fedora-package-announce/2007-December/msg00352.html
mandriva.com / security/advisories
novell.com / linux/security/advisories/2007_54_xorg.html
redhat.com / support/errata/RHSA-2008-0029.html
redhat.com / support/errata/RHSA-2008-0030.html
securityfocus.com / archive/1/481432/100/0/threaded
securityfocus.com / bid/25898
securitytracker.com / id
vupen.com / english/advisories/2007/3337
vupen.com / english/advisories/2007/3338
vupen.com / english/advisories/2007/3467
vupen.com / english/advisories/2008/0149
vupen.com / english/advisories/2008/0924/references