How severe is CVE-2010-2835?

CVE-2010-2835 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2010-2835 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2010-2835?

CVE-2010-2835 primarily affects Cisco Ios. In total, 232 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2010-2835?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2010-2835 published?

CVE-2010-2835 was published on 2010-09-23 and last updated on 2026-06-16.

CVE-2010-2835

CVE-2010-2835 is a high-severity vulnerability in Cisco Ios with a CVSS 2.0 base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Cisco Ios
Published: 2010-09-23
Last modified: 2026-06-16

Description

Cisco IOS 12.2 through 12.4 and 15.0 through 15.1, Cisco IOS XE 2.5.x and 2.6.x before 2.6.1, and Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 6.x before 6.1(5), 7.0 before 7.0(2a)su3, 7.1su before 7.1(3b)su2, 7.1 before 7.1(5), and 8.0 before 8.0(1) allow remote attackers to cause a denial of service (device reload or voice-services outage) via a SIP REFER request with an invalid Refer-To header, aka Bug IDs CSCta20040 and CSCta31358.

Frequently asked questions

What is CVE-2010-2835?: Cisco IOS 12.2 through 12.4 and 15.0 through 15.1, Cisco IOS XE 2.5.x and 2.6.x before 2.6.1, and Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 6.x before 6.1(5), 7.0 before 7.0(2a)su3, 7.1su before 7.1(3b)su2, 7.1 before 7.1(5), and 8.0 before 8.0(1) allow remote attackers to cause a denial of service (device reload or voice-services outage) via a SIP REFER request with an invalid Refer-To header, aka Bug IDs CSCta20040 and CSCta31358.
How severe is CVE-2010-2835?: CVE-2010-2835 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2010-2835 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2010-2835?: CVE-2010-2835 primarily affects Cisco Ios. In total, 232 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2010-2835?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2010-2835 published?: CVE-2010-2835 was published on 2010-09-23 and last updated on 2026-06-16.

References

Affected products (232)

cpe:2.3:o:cisco:ios:12.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1t:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1xi:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1xj:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1xl:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1xm:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1xp:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1xq:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1xr:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1xs:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1xt:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1xu:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1xv:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1xy:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1ya:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1yb:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1yc:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1yd:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1ye:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1yf:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1yh:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.1yi:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2b:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2bw:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2bx:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2by:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2cz:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2dd:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2dx:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2ex:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2ira:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2irb:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2irc:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2ird:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2ire:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2ixa:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2ixb:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2ixc:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2ixd:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2ixe:*:*:*:*:*:*:*

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