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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-28532

27
FAUCET Score

FRRouting before 10.5.3 contains an integer overflow vulnerability in seven OSPF Traffic Engineering and Segment Routing TLV parser functions where a uint16_t accumulator variable truncates uint32_t values returned by the TLV_SIZE() macro, causing the loop termination condition to fail while pointer advancement continues unchecked. Attackers with an established OSPF adjacency can send a crafted LS Update packet with a malicious Type 10 or Type 11 Opaque LSA to trigger out-of-bounds memory reads and crash all affected routers in the OSPF area or autonomous system.

First published: Apr 30, 2026Last modified: May 1, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 10.5.3CPE matchmatch criteria
cpe:2.3:a:frrouting:frrouting:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

6.0MEDIUM

CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
ADJACENT
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.22%
Probability of exploitation in next 30 days
EPSS Percentile
13.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0022 is in the 17th percentile among its peer group of 1,802 CVEs.

Social Chatter

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

Media Mentions

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 (5)

github_advisorypatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: azl3 frr 10.5.0-2 on Azure Linux 3.0Fixed in: 10.5.0-3
microsoftpatch availablevia msrc
Product: azl3 frr 10.5.0-3 on Azure Linux 3.0Fixed in: 10.5.0-3
microsoftpatch availablevia msrc
Product: 21208-17084Fixed in: 10.5.0-3
microsoftpatch availablevia msrc
Product: 21317-17084Fixed in: 10.5.0-3

Vendor Advisories (1)

microsoft2026-Apr/CVE-2026-28532Moderate

FRRouting < 10.5.3 Integer Overflow in OSPF TLV Parser Functions

Apr 14, 2026

References

github.com / FRRouting/frr/commit/f098decf02987fbf1c891766c1516ac832adadfd
Patch
github.com / FRRouting/frr/pull/21002
Issue TrackingPatch
github.com / FRRouting/frr/releases/tag/frr-10.5.3
Release Notes
vulncheck.com / advisories/frrouting-integer-overflow-in-ospf-tlv-parser-functions
Third Party Advisory